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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (106,413,000) $ (434,722,000)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 152,882,000 186,797,000
Impairment of goodwill   395,060,000
Dry holes and abandonments 147,000 174,000
Deferred income tax benefit (20,973,000) (68,194,000)
Stock-based compensation expense 5,891,000 9,160,000
Net gain on asset disposals (840,000) (1,239,000)
Credit loss expense 0 1,055,000
Amortization of debt discount and issuance costs 205,000 228,000
Changes in operating assets and liabilities:    
Accounts receivable (20,877,000) 19,490,000
Income taxes receivable/payable 4,273,000 (1,978,000)
Inventory and other assets (2,825,000) 8,392,000
Accounts payable 9,383,000 (22,999,000)
Accrued liabilities (10,882,000) (15,592,000)
Other liabilities (1,349,000) (2,341,000)
Net cash provided by operating activities 8,622,000 73,291,000
Cash flows from investing activities:    
Purchases of property and equipment (18,523,000) (71,928,000)
Proceeds from disposal of assets and insurance claims 2,713,000 4,280,000
Other (105,000)  
Net cash used in investing activities (15,915,000) (67,648,000)
Cash flows from financing activities:    
Purchases of treasury stock   (20,025,000)
Dividends paid (3,754,000) (7,629,000)
Net cash used in financing activities (3,754,000) (27,654,000)
Effect of foreign exchange rate changes on cash 276,000 26,000
Net decrease in cash and cash equivalents (10,771,000) (21,985,000)
Cash and cash equivalents at beginning of period 224,915,000 174,185,000
Cash and cash equivalents at end of period 214,144,000 152,200,000
Net cash received (paid) during the period for:    
Interest, net of capitalized interest of $24 in 2021 and $252 in 2020 (10,232,000) (11,401,000)
Income taxes 4,256,000 (2,000)
Non-cash investing and financing activities:    
Net increase (decrease) in payables for purchases of property and equipment 161,000 (7,365,000)
Net (increase) decrease in deposits on equipment purchases $ (242,000) $ 1,336,000