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Loss per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Earnings Per Share [Abstract]          
Basic loss $ (404,337) $ (649,526) $ (1,249,795) $ (3,070,916)  
Weighted Average Shares, Basic 718,373 526,388 708,788 500,077  
Basic loss per share (in dollars per share) $ (0.56) $ (1.23) $ (1.76) $ (6.14)  
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  
Convertible senior unsecured notes   $ 0   $ 0  
Convertible senior unsecured notes (in shares)   0   0  
Diluted loss $ (404,337) $ (649,526) $ (1,249,795) $ (3,070,916)  
Weighted average shares, diluted 718,373 526,388 708,788 500,077  
Diluted loss per share (in dollars per share) $ (0.56) $ (1.23) $ (1.76) $ (6.14)  
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  
Convertible Debt          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares)   43,400   14,600  
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%
Convertible Debt | 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% 8.125% 8.125%  
Convertible Debt | 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% 7.50% 7.50%