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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net loss $ (156,369) $ (9,850)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 347,745 357,306
Dry holes and abandonments   114
Deferred income tax benefit (58,643) (40,225)
Stock-based compensation expense 14,192 13,831
Net gain on asset disposals (7,267) (5,914)
Tax expense on stock-based compensation (2,995)  
Amortization of debt issuance costs 723 522
Changes in operating assets and liabilities:    
Accounts receivable 91,559 330,176
Income taxes receivable/payable (2,329) 93,527
Inventory and other assets 3,795 11,555
Accounts payable (25,738) (108,424)
Accrued expenses (21,658) (1,894)
Other liabilities (1,088) (63)
Net cash provided by operating activities 181,927 640,661
Cash flows from investing activities:    
Purchases of property and equipment (51,834) (463,633)
Proceeds from disposal of assets 12,350 10,728
Net cash used in investing activities (39,484) (452,905)
Cash flows from financing activities:    
Purchases of treasury stock (3,611) (8,010)
Dividends paid (17,665) (29,352)
Tax benefit related to stock-based compensation   1,129
Debt issuance costs   (1,979)
Proceeds from long-term debt   200,000
Repayment of long-term debt (25,000) (10,000)
Proceeds from borrowings under revolving credit facility   54,000
Repayment of borrowings under revolving credit facility   (357,000)
Net cash used in financing activities (46,276) (151,212)
Effect of foreign exchange rate changes on cash 114 (3,050)
Net increase in cash and cash equivalents 96,281 33,494
Cash and cash equivalents at beginning of period 113,346 43,012
Cash and cash equivalents at end of period 209,627 76,506
Net cash (paid) received during the period for:    
Interest, net of capitalized interest of $286 in 2016 and $3,343 in 2015 (20,252) (16,506)
Income taxes 19,603 63,740
Non-cash investing and financing activities:    
Net increase (decrease) in payables for purchases of property and equipment 9,283 (50,487)
Net decrease in deposits on equipment purchases $ 4,397 $ 64,638