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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Operating activities:    
Net income (loss) $ 187,280 $ 60,233
Income (loss) from discontinued operations, net of tax (254) 4,867
Income from continuing operations 187,534 55,366
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 288,816 260,858
Earnings (loss), net of distributions, from equity method investments 1,736 (1,086)
Deferred income taxes 46,212 40,310
Unrealized loss on commodity derivatives 5,379 523
Write-down of oil and natural gas properties 0 160,100
Changes in current assets and liabilities, net of acquisitions:    
Receivables (107,482) (89,596)
Inventories 1,562 (40,386)
Other current assets (15,397) (18,512)
Accounts payable 25,817 21,811
Other current liabilities 18,680 (32,994)
Other noncurrent changes (24,149) (20,206)
Net cash provided by continuing operations 428,708 336,188
Net cash provided by (used in) discontinued operations 254 (6,826)
Net cash provided by operating activities 428,962 329,362
Investing activities:    
Capital expenditures (648,465) (629,776)
Acquisitions, net of cash acquired 0 (67,253)
Net proceeds from sale or disposition of property and other 40,985 31,090
Investments 218 11,188
Proceeds from sale of equity method investment 1,896 2,394
Net cash used in continuing operations (605,366) (652,357)
Net cash provided by discontinued operations 0 0
Net cash used in investing activities (605,366) (652,357)
Financing activities:    
Issuance of short-term borrowings 5,000 2,900
Issuance of long-term debt 497,318 400,443
Repayment of long-term debt (255,980) (73,459)
Proceeds from issuance of common stock 0 88
Dividends paid (65,660) (95,394)
Excess tax benefit on stock-based compensation 0 26
Contribution from noncontrolling interest 13,000 0
Net cash provided by continuing operations 193,678 234,604
Net cash provided by discontinued operations 0 0
Net cash provided by financing activities 193,678 234,604
Effect of exchange rate changes on cash and cash equivalents (142) (139)
Increase (decrease) in cash and cash equivalents 17,132 (88,530)
Cash and cash equivalents - beginning of year 49,042 162,772
Cash and cash equivalents - end of period $ 66,174 $ 74,242