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Series B Preferred Stock - Dividends and Redemptions (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jan. 31, 2015
Dec. 30, 2014
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Sep. 30, 2015
Aug. 14, 2015
Jul. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Preferred Stock                    
Preferred stock                 $ 47,331  
Preferred Stock, Shares Outstanding                 47,331  
Series B Stock                    
Preferred Stock                    
Repurchase price percentage of liquidation value (as a percent)         94.75%          
Payments for repurchase of preferred stock         $ 24,300          
Shares redeemed (in shares) 15,778   25,669 15,778 25,669          
Preferred stock                 $ 47,300 $ 72,900
Shares to be redeemed, percent of issued and outstanding   33.33%                
Preferred Stock, Shares Outstanding   47,331   31,553   0   31,553    
Preferred Stock, Redemption Price Per Share   $ 1,000         $ 1,000 $ 1,000