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Summary of Significant Accounting Policies (Details 8) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 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
Summary of Significant Accounting Policies                      
Net (loss) income $ (149,781) $ (15,348) $ (19,273) $ 580 $ (674,556) $ 40,949 $ (12,548) $ 64,903 $ (183,822) $ (581,252) $ 210,497
Basic shares outstanding                 78,425 78,111 76,345
Calculation of basic EPS:                      
Net (loss) income applicable to common stock                     $ 169,759
Weighted-average common shares outstanding                 78,425 78,111 76,345
Basic EPS (in dollars per share) $ (1.90) $ (0.20) $ (0.25) $ 0.01 $ (8.65) $ 0.43 $ (0.16) $ 0.67 $ (2.34) $ (7.44) $ 2.22
Calculation of diluted EPS using if-converted method:                      
Net (loss) income $ (149,781) $ (15,348) $ (19,273) $ 580 $ (674,556) $ 40,949 $ (12,548) $ 64,903 $ (183,822) $ (581,252) $ 210,497
Diluted weighted-average common shares outstanding                 78,425 78,111 103,804
Diluted EPS (in dollars per share) $ (1.90) $ (0.20) $ (0.25) $ 0.01 $ (8.65) $ 0.40 $ (0.16) $ 0.63 $ (2.34) $ (7.44) $ 2.03