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Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
installment
$ / shares
shares
Jun. 30, 2015
$ / shares
shares
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
installment
$ / shares
shares
Sep. 30, 2014
USD ($)
Aug. 17, 2015
$ / shares
May. 15, 2015
$ / shares
Equity Disclosure                    
Common stock, shares authorized   1,800,000,000     800,000,000   1,800,000,000      
Preferred stock, shares authorized   50,000,000     50,000,000   50,000,000      
Common stock issued for debt exchange (in shares)   8,000,000                
Reduction to preferred stock dividends | $   $ 9,114       $ 11,381 $ 27,069 $ 39,144    
Additional paid-in capital—stockholder receivable | $   $ 2,500     $ 2,500   $ 2,500      
Shareholder receivable, number of annual installments | installment   2         2      
8.5% Convertible perpetual preferred stock                    
Equity Disclosure                    
Preferred stock, dividend rate, percentage             8.50% 8.50%    
Cash dividends | $       $ 11,300            
Dividends declared, per share (usd per share) | $ / shares   $ 4.25                
Convertible perpetual preferred stock dividends, common stock issued (in shares)   18,600,000                
Number of trading days used in calculation of value of shares issued             15 days      
Percentage multiplier used in calculation of value of shares issued             95.00%      
Market value of common stock issued as dividends | $             $ 9,500      
Common stock issued, value per preferred share (usd per share) | $ / shares                 $ 3.58  
Preferred stock, shares outstanding   2,650,000     2,650,000   2,650,000      
Reduction to preferred stock dividends | $   $ 1,800         $ 1,800      
7.0% Convertible perpetual preferred stock                    
Equity Disclosure                    
Preferred stock, dividend rate, percentage             7.00% 7.00%    
Dividends declared, per share (usd per share) | $ / shares             $ 3.50      
Convertible perpetual preferred stock dividends, common stock issued (in shares)             5,700,000      
Number of trading days used in calculation of value of shares issued             15 days      
Percentage multiplier used in calculation of value of shares issued             95.00%      
Market value of common stock issued as dividends | $             $ 6,700      
Common stock issued, value per preferred share (usd per share) | $ / shares                   $ 2.23
Preferred stock, shares outstanding   3,000,000     3,000,000   3,000,000      
Reduction to preferred stock dividends | $   $ 3,800         $ 3,800      
6.0% Convertible perpetual preferred stock                    
Equity Disclosure                    
Preferred stock, dividend rate, percentage               6.00%    
Shares of common stock issued related to the conversion of preferred stock (in shares)         18,400,000          
Convertible Senior Unsecured Notes                    
Equity Disclosure                    
Notes exchanged/converted | $   $ 21,900                
Senior Notes                    
Equity Disclosure                    
Notes exchanged/converted | $ $ 275,000                  
Senior Notes | 7.5% Senior Notes due 2021 and 8.125% Senior Notes due 2022                    
Equity Disclosure                    
Common stock issued for debt exchange (in shares)     28,000,000              
Notes exchanged/converted | $             $ 50,000      
Common and Preferred Stock                    
Equity Disclosure                    
Shares authorized     1,850,000,000   850,000,000          
Shares authorized, par value (usd per share) | $ / shares     $ 0.001   $ 0.001          
Common Stock                    
Equity Disclosure                    
Common stock issued for debt exchange (in shares)   8,000,000         36,012,000      
Convertible perpetual preferred stock dividends, common stock issued (in shares)             24,289,000      
Common Stock | Senior Notes                    
Equity Disclosure                    
Common stock issued for debt exchange (in shares)             28,000,000