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Supplemental Information on Oil and Natural Gas Producing Activities - Results of Operations from Oil, Natural Gas and NGL Producing Activities (Unaudited) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Results of Operations, Oil and Gas Producing Activities Net Income (Excluding Corporate Overhead and Interest Costs) [Abstract]      
Revenues $ 1,820,278 $ 1,759,282 $ 1,226,794
Expenses      
Production costs 548,719 524,364 368,946
Depreciation and depletion 567,732 568,029 317,246
Accretion of asset retirement obligations 36,777 28,996 9,368
Total expenses 1,153,228 1,121,389 695,560
Income before income taxes 667,050 637,893 531,234
Benefit of income taxes(1) (7,471) [1] (437,595) [1] (20,134) [1]
Results of operations for oil and natural gas producing activities (excluding corporate overhead and interest costs) $ 674,521 $ 1,075,488 $ 551,368
[1] Reflects the Company’s effective tax rate, including the partial valuation allowance releases.