Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net loss	$ (10,838)	$ (87,784)	$ (61,684)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	164,116	142,686	141,514
Amortization of debt discount	17
Amortization of debt issuance costs	2,485	2,334	3,179
Share-based compensation	6,510	7,451	7,689
Deferred income taxes	11,532	4,386	(15,202)
Equity in (earnings) losses of investment		(8,262)	1
(Gain) loss on disposition of assets, net	(367)		631
Loss on extinguishment of long-term debt	37,277		136
Unrealized foreign currency loss	8,310	21,596	2,252
Change in fair value of contingent consideration	42,246	16,054
Changes in operating assets and liabilities:
Accounts receivable, net	(64,520)	(29,865)	(14,154)
Other current assets	(22,597)	7,593	22,973
Income tax payable, net of income tax receivable	(418)	(49)	18,610
Accounts payable and accrued liabilities	31,996	9,807	46,645
Deferred recertification and dry dock costs, net	(62,522)	(35,072)	(9,620)
Other, net	9,230	233	(2,853)
Net cash provided by operating activities	152,457	51,108	140,117
Cash flows from investing activities:
Alliance acquisition, net of cash acquired		(112,625)
Capital expenditures	(19,588)	(33,504)	(8,322)
Distribution from equity investment, net		7,840
Proceeds from sale of assets	365		51
Proceeds from insurance recoveries	564
Net cash used in investing activities	(18,659)	(138,289)	(8,271)
Cash flows from financing activities:
Proceeds from senior notes, net of discount	298,578
Payments related to convertible senior notes	(261,147)	(35,000)
Proceeds from settlement of capped calls	15,591
Debt issuance costs	(6,817)	(580)	(1,337)
Acquisition of redeemable noncontrolling interests			(2,355)
Repurchases of common stock	(11,988)
Payments related to tax withholding for share-based compensation	(1,757)	(1,902)	(2,001)
Proceeds from issuance of ESPP shares	982	575	654
Net cash provided by (used in) financing activities	25,109	(44,844)	(95,997)
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(15,827)	(5,991)	(42)
Net increase (decrease) in cash and cash equivalents and restricted cash	143,080	(138,016)	35,807
Cash and cash equivalents and restricted cash:
Balance, beginning of year	189,111	327,127	291,320
Balance, end of year	332,191	189,111	327,127
Term Loan Repaid September 2021
Cash flows from financing activities:
Repayment of loan debt			(29,826)
Nordea Q5000 Loan Matured January 2021
Cash flows from financing activities:
Repayment of loan debt			(53,572)
MARAD Debt (matures February 2027)
Cash flows from financing activities:
Repayment of loan debt	$ (8,333)	$ (7,937)	$ (7,560)