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Equity - Narrative (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Equity Disclosure      
Common stock issued for debt exchange (in shares) 84,400    
Additional paid-in capital—stockholder receivable $ 1,250   $ 1,250
8.5% Convertible perpetual preferred stock      
Equity Disclosure      
Preferred stock, dividend rate, percentage 8.50%    
Cash dividends   $ 11,300  
Preferred Stock, Amount of Preferred Dividends in Arrears $ 11,300    
7.0% Convertible perpetual preferred stock      
Equity Disclosure      
Preferred stock, dividend rate, percentage 7.00%    
Preferred Stock, Amount of Preferred Dividends in Arrears $ 10,500    
Common Stock      
Equity Disclosure      
Common stock issued for debt exchange (in shares) 84,390    
Convertible Senior Unsecured Notes      
Equity Disclosure      
Notes exchanged/converted $ 232,100    
Convertible Senior Unsecured Notes | Common Stock      
Equity Disclosure      
Common stock issued for debt exchange (in shares) 84,400