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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Cash flows from operating activities:  
Net income$ 234,818$ 63,088
Adjustments to reconcile net income to net cash provided by operating activities:  
Depreciation, depletion, amortization and impairment309,677239,930
Provision for bad debts (1,500)
Dry holes and abandonments221479
Deferred income tax expense110,15940,368
Stock-based compensation expense15,36611,881
Net (gain) loss on asset disposals(4,058)[1](21,940)[1]
Tax expense related to stock-based compensation (2,535)
Changes in operating assets and liabilities:  
Accounts receivable(133,371)(97,455)
Income taxes receivable/payable76,018114,209
Inventory and other assets(10,625)(6,864)
Accounts payable58,02031,674
Accrued expenses6,46018,227
Other liabilities(6,449)2,218
Net cash provided by (used in) operating activities of discontinued operations(339)10,687
Net cash provided by operating activities655,897402,467
Cash flows from investing activities:  
Purchases of property and equipment(711,436)(513,679)
Proceeds from disposal of assets9,05427,224
Net cash provided by investing activities of discontinued operations25,50042,646
Net cash used in investing activities(676,882)(443,809)
Cash flows from financing activities:  
Purchases of treasury stock(4,219)(1,848)
Dividends paid(23,257)(23,087)
Debt issuance costs (10,328)
Proceeds from long-term debt 100,000
Repayment of long-term debt(3,750) 
Borrowings under revolving credit facility15,800 
Tax benefit related to stock-based compensation5,838 
Proceeds from exercise of stock options14,040290
Net cash provided by financing activities4,45265,027
Effect of foreign exchange rate changes on cash(434)354
Net increase (decrease) in cash and cash equivalents(16,967)24,039
Cash and cash equivalents at beginning of period27,61249,877
Cash and cash equivalents at end of period10,64573,916
Net cash (paid) received during the period for:  
Interest expense, net of capitalized interest of $6,575 in 2011 and $0 in 2010(5,695)(3,031)
Income taxes60,033115,661
Supplemental investing and financing information:  
Net increase in payables for purchases of property and equipment48,10666,819
Net increase in deposits on equipment purchases$ (29,848)$ (48,946)
[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.