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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (292,720,000) $ (697,165,000)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 437,984,000 517,201,000
Impairment of goodwill 0 395,060,000
Dry holes and abandonments 177,000 1,256,000
Deferred income tax benefit (54,754,000) (100,212,000)
Stock-based compensation expense 16,873,000 20,087,000
Net gain on asset disposals (5,595,000) (3,357,000)
Net gain on insurance reimbursement 0 (4,172,000)
Writedown of capacity reservation contract 0 9,207,000
Credit loss expense 0 5,606,000
Restructuring expenses, non-cash 0 24,068,000
Amortization of debt discount and issuance costs 620,000 673,000
Changes in operating assets and liabilities:    
Accounts receivable (103,241,000) 202,733,000
Income taxes receivable/payable 4,378,000 1,285,000
Inventory and other assets 1,486,000 22,250,000
Accounts payable 59,357,000 (57,788,000)
Accrued liabilities (8,009,000) (44,607,000)
Other liabilities (4,958,000) (8,840,000)
Net cash provided by operating activities 51,598,000 283,285,000
Cash flows from investing activities:    
Purchases of property and equipment (90,837,000) (135,043,000)
Proceeds from disposal of assets and insurance claims 20,558,000 17,792,000
Other (345,000) (121,000)
Net cash used in investing activities (70,624,000) (117,372,000)
Cash flows from financing activities:    
Purchases of treasury stock (3,574,000) (21,129,000)
Dividends paid (11,303,000) (15,110,000)
Debt issuance costs 0 145,000
Net cash used in financing activities (14,877,000) (36,384,000)
Effect of foreign exchange rate changes on cash 272,000 27,000
Net increase (decrease) in cash and cash equivalents (33,631,000) 129,556,000
Cash and cash equivalents at beginning of period 224,915,000 174,185,000
Cash and cash equivalents at end of period 191,284,000 303,741,000
Net cash received (paid) during the period for:    
Interest, net of capitalized interest of $117 in 2021 and $425 in 2020 (31,031,000) (32,605,000)
Income taxes 4,196,000 3,550,000
Non-cash investing and financing activities:    
Net increase (decrease) in payables for purchases of property and equipment 14,801,000 (38,312,000)
Net (increase) decrease in deposits on equipment purchases $ (66,000) $ 3,338,000