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Loss per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Earnings Per Share [Abstract]          
Basic loss $ (521,351) $ (1,375,556) $ (845,458) $ (2,421,390)  
Weighted Average Shares, Basic 718,102 495,153 703,943 486,704  
Basic loss per share (in dollars per share) $ (0.73) $ (2.78) $ (1.20) $ (4.98)  
Effect of dilutive securities          
Restricted stock and units $ 0 $ 0 $ 0 $ 0  
Restricted stock and units (in shares) 0 0 0 0  
Convertible preferred stock   $ 0   $ 0  
Convertible preferred stock (in shares)   0   0  
Diluted loss $ (521,351) $ (1,375,556) $ (845,458) $ (2,421,390)  
Weighted average shares, diluted 718,102 495,153 703,943 486,704  
Diluted loss per share (in dollars per share) $ (0.73) $ (2.78) $ (1.20) $ (4.98)  
8.125% Convertible Senior Notes due 2022          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Long-term debt, fixed interest rate 8.125%   8.125%    
7.5% Convertible Senior Notes due 2023          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Long-term debt, fixed interest rate 7.50%   7.50%    
Convertible Preferred Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares)   71,700   71,700  
8.5% Convertible perpetual preferred stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Preferred stock, dividend rate, percentage   8.50% 8.50% 8.50% 8.50%
7.0% Convertible perpetual preferred stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Preferred stock, dividend rate, percentage   7.00% 7.00% 7.00% 7.00%