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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
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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 | $ 254,295 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1],[2] | $ 145,957 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1],[2] | $ (46,775)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1],[2] | $ (150,217)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1],[2] | $ 29,480 us-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] | $ 203,260 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ (609,414)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 86,046 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Weighted average shares, basic (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 479,644 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 481,148 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 453,595 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Basic earnings per share (in dollars) | $ 0.55 us-gaap_EarningsPerShareBasic | [6] | $ 0.30 us-gaap_EarningsPerShareBasic | [6] | $ (0.10)us-gaap_EarningsPerShareBasic | [6] | $ (0.31)us-gaap_EarningsPerShareBasic | [6] | $ 0.06 us-gaap_EarningsPerShareBasic | [6] | $ (0.20)us-gaap_EarningsPerShareBasic | [6] | $ (0.09)us-gaap_EarningsPerShareBasic | [6] | $ (1.05)us-gaap_EarningsPerShareBasic | [6] | $ 0.42 us-gaap_EarningsPerShareBasic |  | $ (1.27)us-gaap_EarningsPerShareBasic |  | $ 0.19 us-gaap_EarningsPerShareBasic |
Effect of dilutive securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock (in dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits |  | 0 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | [7] | 0 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits |
Restricted stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,181 us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends |  | 0 us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends | [7] | 2,420 us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends |
Convertible preferred stock (in dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,500 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther | [8] | 0 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther | [9] | 0 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther | [9]
Convertible preferred stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,918 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock | [8] | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock | [9] | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock | [9]
Income (Loss), Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 209,760 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | $ (609,414)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | $ 86,046 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |
Weighted average shares, diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 499,743 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 481,148 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 456,015 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Diluted earnings per share (in dollars) | $ 0.48 us-gaap_EarningsPerShareDiluted | [6] | $ 0.27 us-gaap_EarningsPerShareDiluted | [6] | $ (0.10)us-gaap_EarningsPerShareDiluted | [6] | $ (0.31)us-gaap_EarningsPerShareDiluted | [6] | $ 0.06 us-gaap_EarningsPerShareDiluted | [6] | $ (0.20)us-gaap_EarningsPerShareDiluted | [6] | $ (0.09)us-gaap_EarningsPerShareDiluted | [6] | $ (1.05)us-gaap_EarningsPerShareDiluted | [6] | $ 0.42 us-gaap_EarningsPerShareDiluted |  | $ (1.27)us-gaap_EarningsPerShareDiluted |  | $ 0.19 us-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.

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