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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net loss $ (240,512) $ (235,828)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 511,209 689,457
Impairment of goodwill   124,561
Dry holes and abandonments   159
Deferred income tax benefit (109,045) (110,231)
Stock-based compensation expense 21,130 21,186
Net gain on asset disposals (9,808) (7,276)
Tax expense on stock-based compensation (4,895)  
Amortization of debt issuance costs 2,184 884
Changes in operating assets and liabilities:    
Accounts receivable 74,742 359,304
Income taxes receivable 28,524 52,037
Inventory and other assets 7,876 26,695
Accounts payable (19,652) (120,740)
Accrued expenses (7,616) 7,274
Other liabilities (1,431) (1,443)
Net cash provided by operating activities 252,706 806,039
Cash flows from investing activities:    
Purchases of property and equipment (80,511) (608,220)
Proceeds from disposal of assets 18,384 15,920
Cash acquired in acquisition 155  
Net cash used in investing activities (61,972) (592,300)
Cash flows from financing activities:    
Purchases of treasury stock (3,611) (8,010)
Dividends paid (20,618) (44,064)
Tax benefit related to stock-based compensation   458
Debt issuance costs (3,357) (1,979)
Proceeds from long-term debt   200,000
Repayment of long-term debt (255,000) (17,500)
Proceeds from borrowings under revolving credit facility 95,000 54,000
Repayment of borrowings under revolving credit facility (80,000) (357,000)
Net cash used in financing activities (267,586) (174,095)
Effect of foreign exchange rate changes on cash 478 (6,191)
Net increase (decrease) in cash and cash equivalents (76,374) 33,453
Cash and cash equivalents at beginning of period 113,346 43,012
Cash and cash equivalents at end of period 36,972 76,465
Net cash (paid) received during the period for:    
Interest, net of capitalized interest of $327 in 2016 and $4,946 in 2015 (21,973) (18,734)
Income taxes 44,987 63,785
Non-cash investing and financing activities:    
Net increase (decrease) in payables for purchases of property and equipment 16,884 (95,371)
Issuance of common stock for business acquisition 6,733  
Net decrease in deposits on equipment purchases $ 4,667 $ 76,516