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Earnings Per Share - Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2015
Dec. 30, 2014
Apr. 30, 2014
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2015
Aug. 14, 2015
Jul. 31, 2015
Dec. 31, 2014
Redemption of stock                      
Net proceeds from sale of common stock             $ 64,395        
Preferred stock, Shares outstanding                     47,331
Series B Stock                      
Redemption of stock                      
Shares redeemed (in shares) 15,778     25,669 15,778 25,669          
Repurchase price percentage of liquidation value (as a percent)           94.75%          
Shares to be redeemed, percent of issued and outstanding   33.33%                  
Preferred Stock, Redemption Price Per Share   $ 1,000             $ 1,000 $ 1,000  
Preferred stock, Shares outstanding   47,331     31,553     0   31,553  
Common                      
Redemption of stock                      
Shares issued     15,525,000                
Net proceeds from sale of common stock     $ 64,000