Document and Entity Information [Abstract] Document And Entity Information [Abstract] Document Type Document Type Document Annual Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Securities Act File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company ICFR Auditor Attestation Flag Document Financial Statement Error Correction [Flag] Entity Shell Company Entity Shell Company Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Auditor Name Auditor Firm ID Auditor Location Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Documents Incorporated by Reference [Text Block] CONSOLIDATED BALANCE SHEETS Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Accounts Receivable, after Allowance for Credit Loss, Current Accounts receivable, net of allowance for credit losses of $3,682 and $3,407, respectively Other Assets, Current Other current assets Total other current assets Assets, Current Total current assets Property, Plant and Equipment, Gross Property and equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less accumulated depreciation Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Deferred recertification and dry dock costs, Net Deferred Recertification And Dry Dock Costs, Net Deferred recertification and dry dock costs, net Other Assets, Noncurrent Other assets, net Total other assets, net Assets Total assets Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued liabilities Total accrued liabilities Long-Term Debt, Current Maturities Less: current maturities Current maturities of long-term debt Operating Lease, Liability, Current Current operating lease liabilities Liabilities, Current Total current liabilities Long-Term Debt, Excluding Current Maturities Long-term debt Long-term debt Operating Lease, Liability, Noncurrent Operating lease liabilities Non-current operating lease liabilities Deferred Income Tax Liabilities, Net Deferred tax liabilities Other Liabilities, Noncurrent Other non-current liabilities Total other non-current liabilities Liabilities Total liabilities Commitments and Contingencies Commitments and contingencies Equity, Attributable to Parent [Abstract] Shareholders' equity: Common Stock, Value, Issued Common stock, no par, 240,000 shares authorized, 150,243 and 152,291 shares issued, respectively Retained Earnings (Accumulated Deficit) Retained earnings Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Equity, Attributable to Parent Balance, end of period Balance, beginning of period Total shareholders' equity Liabilities and Equity Total liabilities and shareholders' equity Accounts Receivable, Allowance for Credit Loss, Current Balance at end of year Balance at beginning of year Allowance for credit losses Common Stock, Par or Stated Value Per Share Common stock, par value (USD per share) Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued CONSOLIDATED STATEMENTS OF OPERATIONS Revenue from Contract with Customer, Excluding Assessed Tax Net revenues Total Revenue Cost of Revenue Direct cost of revenues Cost of sales Gross Profit Gross profit Gain (Loss) on Disposition of Assets Other segment items (Gain) loss on disposition of assets, net Gain (loss) on disposition of assets, net Business Combination, Acquisition Related Costs Acquisition and integration costs Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Change in fair value of contingent consideration Change in fair value of contingent consideration Selling, General and Administrative Expense Selling, general and administrative expenses Operating Income (Loss) Income (loss) from operations Income (loss) from operations Income (Loss) from Equity Method Investments Equity in earnings of investment Equity in earnings of investment Interest Income (Expense), Nonoperating Net interest expense Net interest expense The gain (loss) recognized on the retirement of the convertible debt instrument. Gain (Loss) on Convertible Debt Instrument Losses related to convertible senior notes Losses related to convertible senior notes Other Nonoperating Income (Expense) Other expense, net Amount of nonoperating income related to income from oil and gas royalty interest and other. Royalty Income And Other Royalty income and other Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (loss) before income taxes Income Tax Expense (Benefit) Income tax provision Income tax provision Net income (loss) Net income (loss) Earnings Per Share Earnings (loss) per share of common stock: Earnings Per Share, Basic Basic Earnings (loss) per share, basic (in dollars per share) Earnings Per Share, Diluted Diluted Earnings (loss) per share, diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Basic Weighted average number of shares outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted Weighted average number of shares outstanding, diluted (in shares) Diluted shares (as reported) CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Other comprehensive income (loss) - foreign currency translation gain (loss), net of tax Foreign currency translation adjustments Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income (loss) CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY Statement [Table] Statement [Table] Equity Components [Axis] Equity Component [Domain] Common Stock [Member] Common Stock Retained Earnings [Member] Retained Earnings AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Loss Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common Stock, Shares, Outstanding Balance, end of period (in shares) Balance, beginning of period (in shares) The amount of total conversion value paid in excess of carrying amount of outstanding convertible debt. Convertible Debt Conversion, Value Paid In Excess Of Carrying Amount Settlement of convertible debt conversion Value of shares issued during the period as a result of the repurchase of convertible debt. Stock Issued During Period, Value, Repurchase Of Convertible Debt Repurchase of convertible senior notes Number of shares issued during the period as a result of the retirement of convertible debt. Stock Issued During Period, Shares, Retirement of Convertible Debt Repurchase of convertible senior notes (in shares) Shares issued for repurchase of debt (in shares) Stock Repurchased During Period, Value Repurchases of common stock Cost of shares repurchased Stock Repurchased During Period, Shares Repurchases of common stock (in shares) Shares repurchased (in shares) The fair value of capped calls associated with convertible debt instruments upon termination. Fair Value, Debt Instrument, Convertible, Associated Capped Calls, Upon Termination Termination of capped calls Fair value of capped call transactions Equity impact of the value of stock due to activity in company stock plan ,net and others. Stock Repurchased During Period, Value , Change in Company Stock Plan, Net And Others Activity in company stock plans, net and other Equity impact of the number of stock due to activity in company stock plan ,net and others. Stock Repurchased During Period, Shares , Change in Company Stock Plan, Net And Others Activity in company stock plans, net and other (in shares) Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Share-based compensation CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income (loss) Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets, excluding amortization of deferred recertification and dry dock costs. Depreciation and Amortization, Excluding Amortization of Deferred Recertification and Dry Dock Costs Depreciation and amortization, excluding amortization of deferred recertification and dry dock costs The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with recertification and dry dock costs. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Amortization of Deferred Recertification and Dry Dock Costs Amortization of deferred recertification and dry dock costs Payments for recertification and dry dock costs to be deferred and amortized. Payments for Deferred Recertification and Dry Dock Costs Deferred recertification and dry dock costs Payment for Contingent Consideration Liability, Operating Activities Payment of earnout consideration Amortization of Debt Discount (Premium) Amortization of debt discount Amortization of Debt Issuance Costs Amortization of debt issuance costs Share-Based Payment Arrangement, Noncash Expense Share-based compensation Deferred Income Tax Expense (Benefit) Deferred income taxes Total deferred Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Unrealized foreign currency loss Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable, net Increase (Decrease) in Other Current Assets Other current assets Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Income tax receivable, net of income tax payable Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and accrued liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Other, net Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Payments to Acquire Businesses, Net of Cash Acquired Alliance acquisition, net of cash acquired Payments to Acquire Productive Assets Capital expenditures Cash paid for acquired assets Proceeds from Equity Method Investment, Distribution, Return of Capital Distribution from equity investment, net Proceeds from Sale of Property, Plant, and Equipment Proceeds from sale of assets Proceeds from Insurance Settlement, Investing Activities Proceeds from insurance recoveries Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Issuance of Senior Long-Term Debt Proceeds from senior notes, net of discount Repayments of Convertible Debt Payments related to convertible senior notes Cash paid for retirement of debt Repayments of Secured Debt Repayment of MARAD Debt Proceeds from Derivative Instrument, Financing Activities Proceeds from settlement of capped calls Payments of Financing Costs Debt issuance costs Payments for Repurchase of Common Stock Repurchases of common stock Payment, Tax Withholding, Share-Based Payment Arrangement Payments related to tax withholding for share-based compensation Proceeds from Stock Plans Proceeds from issuance of ESPP shares Payment for Contingent Consideration Liability, Financing Activities Payment of earnout consideration Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Effect of exchange rate changes on cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, at Carrying Value [Abstract] Cash and cash equivalents: Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Balance, end of year Balance, beginning of year Organization Nature of Operations [Text Block] Organization Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Business Combinations Business Combination Disclosure [Text Block] Business Combinations n/a Details of Certain Accounts Supplemental Balance Sheet Disclosures [Text Block] Details Of Certain Accounts Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Property And Equipment Leases Lessee, Operating Leases [Text Block] Leases Long-Term Debt. Long-Term Debt [Text Block] Long-term Debt Income Taxes Income Tax Disclosure [Text Block] Income Taxes Shareholders' Equity Equity [Text Block] Shareholders' Equity Share Repurchase Programs Treasury Stock [Text Block] Share Repurchase Programs Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Revenue From Contracts With Customers Earnings Per Share [Text Block] Earnings Per Share Employee Benefit Plans Compensation and Employee Benefit Plans [Text Block] Employee Benefit Plans Business Segment Information Segment Reporting Disclosure [Text Block] Business Segment Information Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Asset Retirement Obligations Commitments and Contingencies and Other Matters Commitments and Contingencies Disclosure [Text Block] Commitments And Contingencies And Other Matters Statement of Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Statement Of Cash Flow Information