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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities:      
Net loss $ (196,696) $ (141,219) $ (171,771)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation and amortization 73,030 77,045 51,332
Amortization of deferred drydocking and survey costs 43,679 24,886 6,961
Amortization of debt premiums and discounts 3,961 (4,877) (1,856)
Provision for deferred income taxes 1,224 672 572
Gain on asset dispositions, net (7,591) (2,263) (10,624)
Impairment of due from affiliate 0 0 20,083
Affiliate credit loss impairment expense 52,981 0 0
Affiliate guarantee obligation 2,000 0 0
Long-lived asset impairments and other 74,109 37,773 61,132
Loss on debt extinguishment 0 0 8,119
Changes in investments in unconsolidated companies 0 1,039 28,177
Stock-based compensation expense 5,117 19,603 13,406
Changes in operating assets and liabilities, net:      
Trade and other receivables (2,606) 1,086 9,088
Changes in due to/from affiliate, net 11,949 22,193 28,644
Marine operating supplies 2,588 2,425 (1,955)
Other current assets 4,264 (4,120) 10,893
Accounts payable (10,520) (4,438) (15,174)
Accrued expenses (17,551) 8,189 (13,348)
Other current liabilities 8,685 3,008 1,332
Other liabilities and deferred credits (20,002) 1,270 (2,023)
Deferred drydocking and survey costs (33,271) (70,437) (25,968)
Other, net 8,636 (3,258) 6,921
Net cash provided by (used in) operating activities 3,986 (31,423) 3,941
Cash flows from investing activities:      
Proceeds from sales of assets 38,296 28,847 46,115
Additions to properties and equipment (14,900) (17,998) (21,391)
Cash and cash equivalents from stock-based merger 0 0 43,806
Net cash provided by investing activities 23,396 10,849 68,530
Cash flows from financing activities:      
Principal payments on long-term debt (98,080) (133,693) (105,169)
Premium paid for redemption of secured notes 0 (11,402) 0
Cash payments to General Unsecured Creditors 0 0 (8,377)
Loss on debt extinguishment 0 0 (8,119)
Cash received for issuance of common stock 0 0 3
Tax on share-based award (828) (4,467) (4,400)
Other (857) 0 (2,000)
Net cash used in financing activities (99,765) (149,562) (128,062)
Net change in cash, cash equivalents and restricted cash (72,383) (170,136) (55,591)
Cash, cash equivalents and restricted cash at beginning of period 227,608 [1] 397,744 [1] 453,335
Cash, cash equivalents and restricted cash at end of period [1] 155,225 227,608 397,744
Supplemental disclosure of cash flow information:      
Interest, net of amounts capitalized 21,235 32,687 32,326
Income taxes 13,018 14,378 16,828
Merger with GulfMark 0 0 285,492
Common stock issued for GulfMark merger $ 0 $ 0 $ 285,492
[1] Cash, cash equivalents and restricted cash at December 31, 2020 and 2019 includes $3.2 million and $3.6 million, respectively, in long-term restricted cash.