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(Loss) Earnings per Share - Calculation of Weighted Average Common Shares Outstanding used in Computation of Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Net (Loss) Income, Basic $ (664,579) $ (649,526) $ (1,375,556) $ (1,045,834) $ 254,295 $ 145,957 $ (46,775) $ (150,217) $ (3,735,495) $ 203,260 $ (609,414)
Weighted Average Shares, basic (in shares)                 521,936 479,644 481,148
(Loss) Earnings Per Share, Basic earnings per share (in dollars per share) $ (1.13) $ (1.23) $ (2.78) $ (2.19) $ 0.55 $ 0.30 $ (0.10) $ (0.31) $ (7.16) $ 0.42 $ (1.27)
Effect of dilutive securities                      
Net (Loss) Income, Restricted stock (in dollars)                 $ 0 $ 0 $ 0
Weighted Average Shares, Restricted stock (in shares)                 0 2,181 0
Net (Loss) Income, Convertible preferred stock (in dollars)                 $ 0 $ 6,500 $ 0
Weighted Average Shares, Convertible preferred stock (in shares)                 0 17,918 0
Net (Loss) Income, Convertible senior unsecured notes (in dollars)                 $ 0    
Weighted Average Shares, Convertible senior unsecured note (in shares)                 0    
Net (Loss) Income, Diluted                 $ (3,735,495) $ 209,760 $ (609,414)
Weighted Average Shares, diluted (in shares)                 521,936 499,743 481,148
(Loss) Earnings Per Share, Diluted earnings per share (in dollars per share) $ (1.13) $ (1.23) $ (2.78) $ (2.19) $ 0.48 $ 0.27 $ (0.10) $ (0.31) $ (7.16) $ 0.42 $ (1.27)