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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, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]                      
Income (Loss), Basic $ 254,295us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [1],[2] $ 145,957us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [1],[2] $ (46,775)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [1],[2] $ (150,217)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [1],[2] $ 29,480us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [3],[4],[5] $ (95,328)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [3],[4],[5] $ (42,389)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [3],[4],[5] $ (501,177)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [3],[4],[5] $ 203,260us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (609,414)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 86,046us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average shares, basic (in shares)                 479,644us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 481,148us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 453,595us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per share (in dollars) $ 0.55us-gaap_EarningsPerShareBasic [6] $ 0.30us-gaap_EarningsPerShareBasic [6] $ (0.10)us-gaap_EarningsPerShareBasic [6] $ (0.31)us-gaap_EarningsPerShareBasic [6] $ 0.06us-gaap_EarningsPerShareBasic [6] $ (0.20)us-gaap_EarningsPerShareBasic [6] $ (0.09)us-gaap_EarningsPerShareBasic [6] $ (1.05)us-gaap_EarningsPerShareBasic [6] $ 0.42us-gaap_EarningsPerShareBasic $ (1.27)us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic
Effect of dilutive securities                      
Restricted stock (in dollars)                 0us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits 0us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits [7] 0us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
Restricted stock (in shares)                 2,181us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends 0us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends [7] 2,420us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends
Convertible preferred stock (in dollars)                 6,500us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther [8] 0us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther [9] 0us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther [9]
Convertible preferred stock (in shares)                 17,918us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock [8] 0us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock [9] 0us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock [9]
Income (Loss), Diluted                 $ 209,760us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (609,414)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 86,046us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average shares, diluted (in shares)                 499,743us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 481,148us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 456,015us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per share (in dollars) $ 0.48us-gaap_EarningsPerShareDiluted [6] $ 0.27us-gaap_EarningsPerShareDiluted [6] $ (0.10)us-gaap_EarningsPerShareDiluted [6] $ (0.31)us-gaap_EarningsPerShareDiluted [6] $ 0.06us-gaap_EarningsPerShareDiluted [6] $ (0.20)us-gaap_EarningsPerShareDiluted [6] $ (0.09)us-gaap_EarningsPerShareDiluted [6] $ (1.05)us-gaap_EarningsPerShareDiluted [6] $ 0.42us-gaap_EarningsPerShareDiluted $ (1.27)us-gaap_EarningsPerShareDiluted $ 0.19us-gaap_EarningsPerShareDiluted
[1] Includes loss (gain) on derivative contracts of $42.5 million, $85.3 million, $(132.6) million and $(329.2) million for the first, second, third and fourth quarters, respectively.
[2] Includes a full cost ceiling limitation impairment of $164.8 million in the first quarter and impairments of drilling assets of $3.1 million and $24.3 million in the second and fourth quarters, respectively.
[3] 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.
[4] Includes loss (gain) on 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.
[5] Includes loss on sale of Permian Properties of $398.9 million in the first quarter of 2013.
[6] (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.
[7] Restricted stock awards covering 0.5 million shares were excluded from the computation of loss per share because their effect would have been antidilutive.
[8] Potential common shares related to the Company’s outstanding 8.5% and 7.0% convertible perpetual preferred stock covering 71.7 million shares for the year ended December 31, 2014 were excluded from the computation of earnings per share because their effect would have been antidilutive under the if-converted method.
[9] Potential common shares related to the Company’s outstanding 8.5%, 6.0% and 7.0% convertible perpetual preferred stock covering 90.1 million shares for the years ended December 31, 2013 and 2012, were excluded from the computation of earnings (loss) per share because their effect would have been antidilutive under the if-converted method.