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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Cash flows from operating activities:    
Net income $ 152,890 $ 33,714
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 198,964 154,499
Provision for bad debts   (1,000)
Dry holes and abandonments 150 486
Deferred income tax expense 70,001 21,388
Stock-based compensation expense 9,850 7,987
Net (gain) loss on asset disposals (2,621) (21,690)
Tax expense related to stock-based compensation   (1,484)
Changes in operating assets and liabilities:    
Accounts receivable (71,416) (47,382)
Income taxes receivable/payable 73,749 113,690
Inventory and other assets (13,719) (13,283)
Accounts payable 10,649 18,441
Accrued expenses 11,863 16,338
Other liabilities (4,748) 1,190
Net cash provided by (used in) operating activities of discontinued operations (339) 10,687
Net cash provided by operating activities 435,273 293,581
Cash flows from investing activities:    
Purchases of property and equipment (427,618) (298,845)
Proceeds from disposal of assets 7,474 25,231
Net cash provided by investing activities of discontinued operations 25,500 42,646
Net cash used in investing activities (394,644) (230,968)
Cash flows from financing activities:    
Purchases of treasury stock (4,216) (1,433)
Dividends paid (15,480) (15,383)
Repayment of long-term debt (2,500)  
Tax benefit related to stock-based compensation 5,241  
Proceeds from exercise of stock options 13,008 290
Net cash used in financing activities (3,947) (16,526)
Effect of foreign exchange rate changes on cash 290 15
Net increase in cash and cash equivalents 36,972 46,102
Cash and cash equivalents at beginning of period 27,612 49,877
Cash and cash equivalents at end of period 64,584 95,979
Net cash (paid) received during the period for:    
Interest expense, net of capitalized interest of $4,468 in 2011 and $0 in 2010 (6,207) (1,733)
Income taxes 61,351 115,727
Supplemental investing and financing information:    
Net increase in payables for purchases of property and equipment 57,808 71,259
Net increase in deposits on equipment purchases $ (15,219) $ (32,026)