Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net income (loss)	$ 95,621	$ (22,193)	$ (129,660)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	128,777	83,522	73,223
Amortization of deferred drydocking and survey costs	51,554	35,638	41,321
Amortization of debt premiums and discounts	4,619	1,679	3,171
Amortization of below market contracts	(3,800)	0	0
Provision (benefit) for deferred income taxes	92	36	(1,287)
(Gain) loss on asset dispositions, net	(8,701)	(250)	2,901
Gain on pension settlement	(2,313)	0	0
Gain on bargain purchase	0	(1,300)	0
Affiliate credit loss impairment expense	0	0	400
Long-lived asset impairments and other	0	714	15,643
Loss on warrants	0	14,175	0
Loss on debt extinguishment	0	0	11,100
Stock-based compensation expense	10,755	7,372	5,638
Changes in operating assets and liabilities, net:
Trade and other receivables	(109,756)	(4,129)	26,120
Due to/from affiliate, net	0	(20)	(123)
Marine operating supplies	1,984	(14,611)	1,365
Prepaid expenses and other current assets	5,813	(4,899)	2,961
Accounts payable	5,985	16,481	3,807
Accrued expenses	20,072	(1,340)	(688)
Other current liabilities	809	(555)	(8,920)
Other liabilities	(740)	(10,930)	(6,849)
Deferred drydocking and survey costs	(97,378)	(56,000)	(27,282)
Other, net	1,312	(3,164)	2,165
Net cash provided by operating activities	104,705	40,226	15,006
Cash flows from investing activities:
Proceeds from asset dispositions	15,506	13,568	34,010
Acquisitions, net of cash acquired	(594,191)	(20,740)	0
Additions to properties and equipment	(31,588)	(16,637)	(8,951)
Net cash provided by (used in) investing activities	(610,273)	(23,809)	25,059
Cash flows from financing activities:
Exercise of warrants	111,483	0	0
Proceeds from issuance of shares	0	187,832	0
Repurchase of SPO acquisition warrants	0	(187,832)	0
Issuance of long-term debt	575,000	0	172,375
Principal payments on long-term debt	(13,677)	0	(198,918)
Purchase of common stock	(35,025)	0	0
Debt extinguishment premium	0	0	(7,781)
Acquisition of non-controlling interest in a majority owned subsidiary	(1,427)	0	0
Debt issuance costs	(14,758)	(393)	(5,737)
Tax on share-based award	(6,040)	(2,323)	(953)
Net cash provided by (used in) financing activities	615,556	(2,716)	(41,014)
Net change in cash, cash equivalents and restricted cash	109,988	13,701	(949)
Cash, cash equivalents and restricted cash at beginning of period	167,977	154,276	155,225
Cash, cash equivalents and restricted cash at end of period	277,965	167,977	154,276
Supplemental disclosure of cash flow information:
Interest, net of amounts capitalized	26,638	15,554	13,747
Income taxes	43,880	22,275	19,013
Supplemental disclosure of noncash investing activities:
Acquisition of SPO	0	162,648	0
Purchase of four vessels	14,265	0	0
Warrants issued for SPO acquisition	0	162,648	0
Repurchase of SPO Acquisition Warrants	0	1,365	0
Debt incurred for the purchase of four vessels	$ 15,235	$ 0	$ 0