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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 188,009 $ 299,477 $ 322,413
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion, amortization and impairment 597,469 526,614 437,279
Provision for bad debts 0 1,100 0
Dry holes and abandonments 89 308 1,213
Deferred income tax expense 50,569 160,436 158,967
Stock-based compensation expense 25,891 23,185 20,904
Net gain on asset disposals (3,384) [1] (33,806) [1] (4,999) [1]
Tax expense related to stock-based compensation   (1,284)  
Changes in operating assets and liabilities:      
Accounts receivable 12,007 52,612 (183,165)
Income taxes receivable/payable 4,447 3,506 77,618
Inventory and other assets 570 5,276 (13,491)
Accounts payable 11,331 (25,199) 41,995
Accrued expenses 1,973 (6,048) 18,313
Other liabilities (100) (837) (8,111)
Net cash used in operating activities of discontinued operations     (339)
Net cash provided by operating activities 888,871 1,005,340 868,597
Cash flows from investing activities:      
Purchases of property and equipment (662,461) (973,988) (1,011,578)
Proceeds from disposal of assets 10,386 66,027 22,495
Net cash provided by investing activities of discontinued operations     25,500
Net cash used in investing activities (652,075) (907,961) (963,583)
Cash flows from financing activities:      
Purchases of treasury stock (73,510) (170,292) (4,314)
Dividends paid (29,112) (30,302) (31,045)
Tax benefit related to stock-based compensation 4,794   6,393
Proceeds from long-term debt   400,000  
Repayment of long-term debt (6,250) (93,750) (6,250)
Proceeds from borrowings under revolving credit facility   123,400 153,100
Repayment of borrowings under revolving credit facility   (233,400) (43,100)
Debt issuance costs   (7,581)  
Proceeds from exercise of stock options 6,959 934 16,811
Net cash provided by (used in) financing activities (97,119) (10,991) 91,595
Effect of foreign exchange rate changes on cash (891) 389 (275)
Net increase (decrease) in cash and cash equivalents 138,786 86,777 (3,666)
Cash and cash equivalents at beginning of year 110,723 23,946 27,612
Cash and cash equivalents at end of year 249,509 110,723 23,946
Net cash (paid) received during the year for:      
Interest, net of capitalized interest of $7,775 in 2013, $8,673 in 2012 and $8,415 in 2011 (26,228) (16,651) (13,177)
Income taxes (42,600) (7,964) 59,251
Non-cash investing and financing activities:      
Net increase (decrease) in payables for purchases of property and equipment (26,899) (27,838) 37,838
Net (increase) decrease in deposits on equipment purchases $ (8,784) $ 55,767 $ (48,459)
[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.