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Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
May. 15, 2015
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    
Reduction to preferred stock dividends $ 7,074   $ 13,881 $ 17,955 $ 27,763  
Additional paid-in capital—stockholder receivable $ 2,500 $ 2,500   $ 2,500    
8.5% Convertible perpetual preferred stock            
Equity Disclosure            
Preferred stock, dividend rate, percentage       8.50% 8.50%  
Cash dividends       $ 11,300    
Preferred stock, shares outstanding 2,650,000 2,650,000   2,650,000    
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 6% preferred stock (in shares)   18,400,000        
7.0% Convertible perpetual preferred stock            
Equity Disclosure            
Preferred stock, dividend rate, percentage       7.00% 7.00%  
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%    
Dividends declared, per share $ 3.50     $ 3.50    
Convertible perpetual preferred stock dividends, common stock issued (in shares)       5,700,000    
Market value of common stock issued as dividends       $ 6,700    
Common stock issued, value per preferred share           $ 2.23
Preferred stock, shares outstanding 3,000,000 3,000,000   3,000,000    
Reduction to preferred stock dividends $ (3,800)     $ (3,800)    
Common and Preferred Stock            
Equity Disclosure            
Shares authorized 1,850,000,000 850,000,000   1,850,000,000    
Shares authorized, par value (usd per share) $ 0.001 $ 0.001   $ 0.001