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Earnings Per Share - Calculation of Weighted Average Common Shares Outstanding used in Computation of Diluted Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]                      
Income (Loss), Basic $ 5,198 [1],[2],[3] $ (87,074) [1],[2],[3] $ (34,317) [1],[2],[3] $ (493,221) [1],[2],[3] $ (301,785) [4],[5],[6] $ (184,301) [4],[5],[6] $ 804,191 [4],[5],[6] $ (232,059) [4],[5],[6] $ (609,414) $ 86,046 $ 52,482
Weighted average shares, basic (in shares)                 481,148 453,595 398,851
Basic earnings per share (in dollars) $ 0.01 [7] $ (0.18) [7] $ (0.07) [7] $ (1.03) [7] $ (0.63) [7] $ (0.39) [7] $ 1.74 [7] $ (0.58) [7] $ (1.27) $ 0.19 $ 0.13
Effect of dilutive securities                      
Restricted stock (in dollars)                 0 [8] 0 0
Restricted stock (in shares)                   2,420 7,794
Income (Loss), Diluted                 $ (609,414) $ 86,046 $ 52,482
Weighted average shares, diluted (in shares)                 481,148 456,015 406,645
Diluted earnings per share (in dollars) $ 0.01 [7] $ (0.18) [7] $ (0.07) [7] $ (1.03) [7] $ (0.63) [7] $ (0.39) [7] $ 1.46 [7] $ (0.58) [7] $ (1.27) $ 0.19 $ 0.13
[1] Includes loss (gain) on commodity derivative contracts of $40.9 million, $(103.7) million, $132.8 million and $(22.9) million for the first, second, third and fourth quarters, respectively.
[2] Includes a $10.6 million impairment of various drilling assets and a $2.9 million impairment of a corporate asset in the second quarter of 2013 and a $2.1 million and $10.0 million impairment of certain midstream inventory, natural gas compressors, gas treating plants and a CO2 compression station in the second and fourth quarters of 2013, respectively.
[3] Includes loss on sale of Permian Properties of $398.9 million in the first quarter of 2013.
[4] Includes loss (gain) on commodity derivative contracts of $254.6 million, $(669.9) million, $193.5 million and $(19.6) million for the first, second, third and fourth quarters, respectively.
[5] Includes a $235.4 million goodwill impairment and a $79.3 million impairment of gas treating plants and CO2 compression facilities in the fourth quarter of 2012.
[6] Includes adjustments of $(4.8) million retrospectively applied to the second quarter of 2012 as a result of measurement period adjustments made to the preliminary purchase price allocation for the Dynamic Acquisition in the fourth quarter of 2012.
[7] (Loss applicable) income available per share to common stockholders for each quarter is computed using the weighted-average number of shares outstanding during the quarter, while earnings per share for the fiscal year is computed using the weighted-average number of shares outstanding during the year. Thus, the sum of (loss applicable) income available per share to common stockholders for each of the four quarters may not equal the fiscal year amount.
[8] Restricted stock awards covering 0.5 million shares were excluded from the computation of loss per share because their effect would have been antidilutive.