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Mezzanine Equity - Schedule of Carrying Value of Preferred Shares (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Preferred Stock [Roll Forward]        
Beginning balance   $ 60,361    
Conversion of Preferred Shares   (62,000) $ (100,000) $ 0
Ending balance   0 60,361  
Series A Preferred Stock [Member]        
Preferred Stock [Roll Forward]        
Beginning balance $ 162,000 60,361 153,372  
Discount for beneficial conversion feature (8,688)      
Conversion of Preferred Shares   (62,000) (100,000)  
Accretion of BCF discount (Deemed dividend) 60 1,639 [1] 6,989 [1]  
Ending balance $ 153,372 $ 0 $ 60,361 $ 153,372
[1] Accretion includes $0.8 million and $3.5 million accelerated write-off of the unamortized discount related to the conversion of Preferred Shares during 2014 and 2013, respectively.