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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net loss $ (803,692,000) $ (425,703,000) $ (321,421,000)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Depreciation, depletion, amortization and impairment 670,910,000 1,003,873,000 916,318,000
Impairment of goodwill 395,060,000 17,800,000 211,129,000
Dry holes and abandonments 1,285,000 109,000 915,000
Deferred income tax benefit (125,283,000) (103,202,000) (41,185,000)
Stock-based compensation expense 26,572,000 39,328,000 37,925,000
Net gain on asset disposals (3,079,000) (13,904,000) (28,958,000)
Net gain on insurance reimbursement (4,172,000)    
Write-down of capacity reservation contract 9,207,000 12,673,000  
Credit loss expense 5,606,000 5,683,000 0
Restructuring expenses, non-cash 25,067,000    
(Gain) loss on early debt extinguishment (3,596,000) 24,023,000  
Amortization of debt discount and issuance costs 912,000 937,000 830,000
Changes in operating assets and liabilities:      
Accounts receivable 173,862,000 213,588,000 23,515,000
Income taxes receivable/payable 1,635,000 (3,353,000) (1,555,000)
Inventory and other assets 27,192,000 29,394,000 (1,470,000)
Accounts payable (48,602,000) (77,686,000) (69,453,000)
Accrued liabilities (59,240,000) (18,218,000) 4,136,000
Other liabilities (10,786,000) (9,139,000) (56,000)
Net cash provided by operating activities 278,858,000 696,203,000 730,670,000
Cash flows from investing activities:      
Acquisitions, net of cash acquired   (13,000) (14,211,000)
Purchases of property and equipment (145,481,000) (347,512,000) (641,458,000)
Proceeds from disposal of assets and insurance claims 20,929,000 45,761,000 47,357,000
Collection of note receivable     23,760,000
Other (424,000)    
Net cash used in investing activities (124,976,000) (301,764,000) (584,552,000)
Cash flows from financing activities:      
Purchases of treasury stock (21,179,000) (255,467,000) (161,737,000)
Dividends paid (18,862,000) (32,428,000) (30,589,000)
Proceeds from long-term debt   496,969,000 521,194,000
Repayment of long-term debt (62,525,000) (673,443,000)  
Proceeds from borrowings under revolving credit facility     79,000,000
Repayment of borrowings under revolving credit facility     (347,000,000)
Debt issuance costs (584,000) (852,000) (4,489,000)
Proceeds from exercise of stock options     485,000
Net cash provided by (used in) financing activities (103,150,000) (465,221,000) 56,864,000
Effect of foreign exchange rate changes on cash (2,000) (62,000) (781,000)
Net increase (decrease) in cash and cash equivalents 50,730,000 (70,844,000) 202,201,000
Cash and cash equivalents at beginning of year 174,185,000 245,029,000 42,828,000
Cash and cash equivalents at end of year 224,915,000 174,185,000 245,029,000
Net cash (paid) received during the year for:      
Interest, net of capitalized interest of $431 in 2020, $732 in 2019 and $1,435 in 2018 (43,368,000) (76,870,000) (41,184,000)
Income taxes 3,709,000 (1,452,000) 3,172,000
Non-cash investing and financing activities:      
Receivable from property and equipment insurance     15,000,000
Net increase (decrease) in payables for purchases of property and equipment (30,241,000) (40,857,000) 36,241,000
Issuance of common stock for business acquisitions     2,932,000
Net decrease in deposits on equipment purchases $ 6,350,000 3,974,000 $ 4,311,000
Cashless exercise of stock options   $ 9,219,000