Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net loss		$ (91,581)	$ (167,269)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization		54,605	53,614
Amortization of deferred drydocking and survey costs		31,651	32,414
Amortization of debt premium and discounts		2,662	2,418
Provision for deferred income taxes		167	107
(Gain) loss on asset dispositions, net		2,954	(7,511)
Loss on debt extinguishment		59	0
Affiliate credit loss impairment expense (credit)		(1,000)	53,581
Affiliate guarantee obligation		0	2,000
Long-lived asset impairments		2,167	67,634
Stock-based compensation expense		4,199	3,959
Changes in assets and liabilities, net:
Trade and other receivables		26,608	9,434
Changes in due to/from affiliates, net		1,210	9,852
Accounts payable		1,061	(14,548)
Accrued expenses		(473)	(18,189)
Deferred drydocking and survey costs		(17,388)	(29,499)
Other, net		(8,833)	3,809
Net cash provided by operating activities		8,068	1,806
Cash flows from investing activities:
Proceeds from asset dispositions		33,956	31,498
Additions to properties and equipment		(2,583)	(4,682)
Net cash provided by investing activities		31,373	26,816
Cash flows from financing activities:
Principal payments on long-term debt		(39,259)	(33,520)
Debt modification costs		(855)	0
Debt extinguishment premium		(59)	0
Tax on share-based awards		(793)	(702)
Net cash used in financing activities		(40,966)	(34,222)
Net change in cash, cash equivalents and restricted cash		(1,525)	(5,600)
Cash, cash equivalents and restricted cash at beginning of period		155,225	227,608
Cash, cash equivalents and restricted cash at end of period	[1]	153,700	222,008
Supplemental disclosure of cash flow information:
Interest, net of amounts capitalized		10,083	16,169
Income taxes		$ 14,735	$ 9,940

[1] Cash, cash equivalents and restricted cash at September 30, 2021 includes $2.2 million in long-term restricted cash, which is included in other assets in our condensed consolidated balance sheet.