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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net loss $ (654,545) $ (803,692) $ (425,703)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Depreciation, depletion, amortization and impairment 849,178 670,910 1,003,873
Impairment of goodwill 0 395,060 17,800
Dry holes and abandonments 178 1,285 109
Deferred income tax benefit (62,980) (125,283) (103,202)
Stock-based compensation expense 21,558 26,572 39,328
Net gain on asset disposals (1,426) (3,079) (13,904)
Net gain on insurance reimbursement 0 (4,172) 0
Write-down of capacity reservation contract 0 9,207 12,673
Credit loss expense (1,500) 5,606 5,683
Restructuring expenses, non-cash 0 25,067
(Gain) loss on early debt extinguishment 0 (3,596) 24,023
Amortization of debt discount and issuance costs 839 912 937
Changes in operating assets and liabilities:      
Accounts receivable (147,356) 173,862 213,588
Income taxes receivable/payable 4,516 1,635 (3,353)
Inventory and other assets (5,850) 27,192 29,394
Accounts payable 50,941 (46,576) (77,281)
Accrued liabilities 50,271 (61,266) (18,623)
Other liabilities (7,812) (10,786) (9,139)
Net cash used in operating activities of discontinued operations (516)    
Net cash provided by operating activities 95,496 278,858 696,203
Cash flows from investing activities:      
Acquisitions, net of cash acquired (29,358) 0 (13)
Purchases of property and equipment (166,320) (145,481) (347,512)
Proceeds from disposal of assets and insurance claims 23,339 20,929 45,761
Other (522) (424) 0
Net cash provided by investing activities of discontinued operations 41,267    
Net cash used in investing activities (131,594) (124,976) (301,764)
Cash flows from financing activities:      
Purchases of treasury stock (6,328) (21,179) (255,467)
Dividends paid (15,605) (18,862) (32,428)
Proceeds from long-term debt 0 0 496,969
Repayment of long-term debt (50,000) (62,525) (673,443)
Debt issuance costs 0 (584) (852)
Net cash used in financing activities (71,933) (103,150) (465,221)
Effect of foreign exchange rate changes on cash 640 (2) (62)
Net increase (decrease) in cash and cash equivalents (107,391) 50,730 (70,844)
Cash and cash equivalents at beginning of year 224,915 174,185 245,029
Cash and cash equivalents at end of year 117,524 224,915 174,185
Net cash (paid) received during the year for:      
Interest, net of capitalized interest of $260 in 2021, $431 in 2020 and $732 in 2019 (40,464) (43,368) (76,870)
Income taxes 4,196 3,709 (1,452)
Non-cash investing and financing activities:      
Net increase (decrease) in payables for purchases of property and equipment 31,393 30,241 40,857
Issuance of common stock for business acquisitions 248,025 0 0
Net decrease in deposits on equipment purchases 867 6,350 3,974
Cashless exercise of stock options $ 0 $ 0 $ 9,219