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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating activities:    
Net income (loss) $ 60,233 $ 152,019
Income (loss) from discontinued operations, net of tax 4,867 154
Income (loss) from continuing operations 55,366 151,865
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 260,858 256,861
Earnings, net of distributions, from equity method investments (1,086) (314)
Deferred income taxes 40,310 79,985
Write-down of oil and natural gas properties 160,100 0
Changes in current assets and liabilities, net of acquisitions:    
Receivables (89,596) (57,829)
Inventories (40,386) (21,004)
Other current assets (18,512) 2,976
Accounts payable 21,811 (8,037)
Other current liabilities (32,994) 31,592
Other noncurrent changes (19,683) (23,908)
Net cash provided by (used in) continuing operations 336,188 412,187
Net cash used in discontinued operations (6,826) (572)
Net cash provided by (used in) operating activities 329,362 411,615
Investing activities:    
Capital expenditures (629,776) (339,461)
Acquisitions, net of cash acquired (67,253) (157)
Net proceeds from sale or disposition of property and other 31,090 23,584
Investments 11,188 (9,768)
Proceeds from Sale of Equity Method Investments 2,394 0
Net cash provided by (used in) continuing operations (652,357) (325,802)
Net cash provided by discontinued operations 0 0
Net cash provided by (used in) investing activities (652,357) (325,802)
Financing activities:    
Issuance of short-term borrowings 2,900 0
Repayment of short-term borrowings 0 (20,000)
Issuance of long-term debt 400,443 300
Repayment of long-term debt (73,459) (83,805)
Proceeds from issuance of common stock 88 5,744
Dividends paid (95,394) (92,473)
Excess tax benefit on stock-based compensation 26 1,248
Net cash provided by (used in) continuing operations 234,604 (188,986)
Net cash provided by discontinued operations 0 0
Net cash provided by (used in) financing activities 234,604 (188,986)
Effect of exchange rate changes on cash and cash equivalents (139) (199)
Decrease in cash and cash equivalents (88,530) (103,372)
Cash and cash equivalents - beginning of year 162,772 222,074
Cash and cash equivalents - end of year $ 74,242 $ 118,702