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Equity - Preferred Stock Dividends (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]      
Dividends satisfied in shares of common stock $ 16,188 $ 0 $ 0
8.5% Convertible perpetual preferred stock      
Class of Stock [Line Items]      
Dividends paid in cash 11,262 22,525 22,525
Dividends satisfied in shares of common stock 11,262 0 0
Accrued dividends at period end 8,447 8,447 8,447
7.0% Convertible perpetual preferred stock      
Class of Stock [Line Items]      
Dividends paid in cash 0 21,000 21,000
Dividends satisfied in shares of common stock 10,500 0 0
Accrued dividends at period end 13,125 2,625 2,625
Dividends in arrears 10,500 0 0
6.0% Convertible perpetual preferred stock      
Class of Stock [Line Items]      
Dividends paid in cash 0 12,000 12,000
Accrued dividends at period end $ 0 $ 0 $ 5,500