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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income (loss) $ 322,413 $ 116,942 $ (38,290)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion, amortization and impairment 437,279 333,493 289,847
Provision for bad debts 0 (2,000) 3,810
Dry holes and abandonments 1,213 519 129
Deferred income tax expense 158,967 147,490 101,443
Stock-based compensation expense 20,904 16,779 18,214
Net (gain) loss on asset disposals (4,999) [1] (22,812) [1] 3,385 [1]
Tax expense related to stock-based compensation   (2,291) (3,004)
Changes in operating assets and liabilities:      
Accounts receivable (183,165) (178,444) 213,813
Income taxes receivable/payable 77,618 43,522 (108,664)
Inventory and other assets (13,491) (8,772) 14,178
Accounts payable 41,995 49,576 (52,673)
Accrued expenses 18,313 18,072 (21,178)
Other liabilities (8,111) 3,234 (92)
Net cash provided by (used in) operating activities of discontinued operations (339) 10,390 32,759
Net cash provided by operating activities 868,597 525,698 453,677
Cash flows from investing activities:      
Acquisitions   (238,022)  
Purchases of property and equipment (1,011,578) (738,090) (452,646)
Proceeds from disposal of assets 22,495 29,409 3,359
Net cash provided by (used in) investing activities of discontinued operations 25,500 42,638 (54)
Net cash used in investing activities (963,583) (904,065) (449,341)
Cash flows from financing activities:      
Purchases of treasury stock (4,314) (1,853) (1,623)
Dividends paid (31,045) (30,796) (30,681)
Tax benefit related to stock-based compensation 6,393    
Proceeds from long-term debt   400,000  
Repayment of long-term debt (6,250) (1,250)  
Proceeds from borrowings under revolving credit facility 153,100 200,000  
Repayment of borrowings under revolving credit facility (43,100) (200,000)  
Debt issuance costs   (10,779) (6,169)
Proceeds from exercise of stock options 16,811 525 569
Net cash provided by (used in) financing activities 91,595 355,847 (37,904)
Effect of foreign exchange rate changes on cash (275) 255 2,222
Net decrease in cash and cash equivalents (3,666) (22,265) (31,346)
Cash and cash equivalents at beginning of year 27,612 49,877 81,223
Cash and cash equivalents at end of year 23,946 27,612 49,877
Net cash (paid) received during the year for:      
Interest, net of capitalized interest of $8,415 in 2011, $2,288 in 2010 and $0 in 2009 (13,177) (2,220) 1,804
Income taxes 59,251 115,666 14,029
Non-cash investing and financing activities:      
Net increase (decrease) in payables for purchases of property and equipment 37,838 29,188 (25,110)
Net (increase) decrease in deposits on equipment purchases $ (48,459) $ (50,170) $ 43,029
[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.