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Consolidated Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 34,822 $ 56,230
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 147,322 136,435
Dry holes and abandonments 283 10
Deferred income tax (benefit) expense (9,993) 24,555
Stock-based compensation expense 6,711 5,903
Net (gain) loss on asset disposals (1,744) [1] 125 [1]
Changes in operating assets and liabilities:    
Accounts receivable (35,434) (25,220)
Income taxes receivable/payable 14,180 1,267
Inventory and other assets 2,513 6,672
Accounts payable 22,264 21,385
Accrued expenses (1,648) (17,698)
Other liabilities 221 53
Net cash provided by operating activities 179,497 209,717
Cash flows from investing activities:    
Purchases of property and equipment (170,372) (174,161)
Proceeds from disposal of assets 6,590 707
Net cash used in investing activities (163,782) (173,454)
Cash flows from financing activities:    
Purchases of treasury stock (43) (2,874)
Dividends paid (14,456) (7,312)
Tax benefit related to stock-based compensation 1,961 2,737
Repayment of long-term debt (2,500) (1,250)
Proceeds from exercise of stock options 8,033 6,295
Net cash used in financing activities (7,005) (2,404)
Effect of foreign exchange rate changes on cash (473) (551)
Net increase in cash and cash equivalents 8,237 33,308
Cash and cash equivalents at beginning of period 249,509 110,723
Cash and cash equivalents at end of period 257,746 144,031
Net cash paid during the period for:    
Interest, net of capitalized interest of $1,667 in 2014 and $2,281 in 2013      
Income taxes (10,001) (3,543)
Supplemental investing and financing information:    
Net increase in current liabilities for purchases of property and equipment 68,802 24,039
Net (increase) decrease in deposits on equipment purchases $ (4,677) $ 7,863
[1] Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.