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Equity - Preferred Stock Terms (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
8.5% Convertible perpetual preferred stock
  
Class of Stock [Line Items]  
Preferred stock, dividend rate, percentage 8.50%
Liquidation preference per share $ 100.00
Annual dividend per share $ 8.50
Conversion rate per share to common stock 12.4805
Conversion date to common stock at Company's option(1) Feb. 20, 2014 [1]
6.0% Convertible perpetual preferred stock
  
Class of Stock [Line Items]  
Preferred stock, dividend rate, percentage 6.00%
Liquidation preference per share $ 100.00
Annual dividend per share $ 6.00
Conversion rate per share to common stock 9.2115
Conversion date to common stock at Company's option(1) Dec. 21, 2014 [1]
7.0% Convertible perpetual preferred stock
  
Class of Stock [Line Items]  
Preferred stock, dividend rate, percentage 7.00%
Liquidation preference per share $ 100.00
Annual dividend per share $ 7.00
Conversion rate per share to common stock 12.8791
Conversion date to common stock at Company's option(1) Nov. 20, 2015 [1]
[1] Conversion is dependent on certain factors, including the Company’s stock trading above specified prices for a set period.