Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities:
Net loss	$ (22,193)	$ (129,660)	$ (196,696)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	83,522	73,223	73,030
Amortization of deferred drydocking and survey costs	35,638	41,321	43,679
Amortization of debt premiums and discounts	1,679	3,171	3,961
Provision (benefit) for deferred income taxes	36	(1,287)	1,224
(Gain) loss on asset dispositions, net	(250)	2,901	(7,591)
Gain on bargain purchase	(1,300)	0	0
Affiliate credit loss impairment expense	0	400	52,981
Affiliate guarantee obligation	0	0	2,000
Long-lived asset impairments and other	714	15,643	74,109
Loss on warrants	14,175	0	0
Loss on debt extinguishment	0	11,100	0
Stock-based compensation expense	7,372	5,638	5,117
Changes in operating assets and liabilities, net:
Trade and other receivables	(4,129)	26,120	(2,606)
Due to/from affiliate, net	(20)	(123)	11,949
Marine operating supplies	(14,611)	1,365	2,588
Prepaid expenses and other current assets	(4,899)	2,961	4,264
Accounts payable	16,481	3,807	(10,520)
Accrued expenses	(1,340)	(688)	(17,551)
Other current liabilities	(555)	(8,920)	8,685
Other liabilities	(10,930)	(6,849)	(20,002)
Deferred drydocking and survey costs	(56,000)	(27,282)	(33,271)
Other, net	(3,164)	2,165	8,636
Net cash provided by operating activities	40,226	15,006	3,986
Cash flows from investing activities:
Proceeds from sales of assets	13,568	34,010	38,296
Acquisitions, net of cash acquired	(20,740)	0	0
Additions to properties and equipment	(16,637)	(8,951)	(14,900)
Net cash provided by (used in) investing activities	(23,809)	25,059	23,396
Cash flows from financing activities:
Proceeds from stock offering	187,832	0	0
Repurchase of SPO acquisition warrants	(187,832)	0	0
Issuance of long-term debt	0	172,375	0
Principal payments on long-term debt	0	(198,918)	(98,080)
Debt extinguishment premium	0	(7,781)	0
Debt issuance and modification costs	(393)	(5,737)	0
Tax on share-based award	(2,323)	(953)	(828)
Other	0	0	(857)
Net cash used in financing activities	(2,716)	(41,014)	(99,765)
Net change in cash, cash equivalents and restricted cash	13,701	(949)	(72,383)
Cash, cash equivalents and restricted cash at beginning of period	154,276	155,225	227,608
Cash, cash equivalents and restricted cash at end of period	167,977	154,276	155,225
Supplemental disclosure of cash flow information:
Interest, net of amounts capitalized	15,554	13,747	21,235
Income taxes	22,275	19,013	13,018
Supplemental disclosure of noncash investing activities:
Acquisition of SPO	162,648	0	0
Warrants issued for SPO acquisition	162,648	0	0
Repurchase of SPO Acquisition Warrants	$ 1,365	$ 0	$ 0