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Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
May 15, 2015
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Equity Disclosure              
Common stock issued for debt exchange (in shares)         84,400,000    
Additional paid-in capital—stockholder receivable   $ 1,250     $ 1,250   $ 1,250
8.5% Convertible perpetual preferred stock              
Equity Disclosure              
Preferred stock, dividend rate, percentage     8.50%   8.50% 8.50% 8.50%
Preferred dividends in arrears         $ 11,300    
Cash dividends       $ 11,300      
Preferred stock, shares outstanding   2,650,000     2,650,000   2,650,000
7.0% Convertible perpetual preferred stock              
Equity Disclosure              
Preferred stock, dividend rate, percentage     7.00%   7.00% 7.00% 7.00%
Preferred dividends in arrears         $ 21,000    
Preferred stock semi-annual dividend (in dollars per share)     $ 3.50     $ 3.50  
Multiplier used in determining price of shares issued (percentage)             95.00%
Multiplier used in determining price of shares issued, trading period             15 days
Preferred stock, shares outstanding 3,000,000 2,597,000     2,597,000   2,770,000
Difference between value of shares issued and dividend     $ 3,800     $ 3,800  
Common Stock              
Equity Disclosure              
Common stock issued for debt exchange (in shares)         84,390,000    
Common Stock | 7.0% Convertible perpetual preferred stock              
Equity Disclosure              
Common Stock Dividends, Shares           5,700,000  
Preferred stock dividend (in shares)     5,700,000        
Stock dividend issued during period (in shares) $ 6,700            
Valuation of stock dividend issued (in dollars per share) $ 2.23            
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)   0     84,400,000