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Series A Preferred Stock - Additional Share Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Oct. 15, 2015
Aug. 17, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Temporary Equity [Line Items]          
Redemption value treated as return of capital     $ 46    
Redemption value treated as dividend     $ 230,315    
Series A Preferred Stock          
Temporary Equity [Line Items]          
Shares outstanding     0   0
Shares redeemed 2,576 62,140 64,809    
Redemption Price (per share) $ 4,610.68 $ 4,446.70      
Total redemption value $ 11,877 $ 276,688 $ 288,565    
Redemption value treated as return of capital     58,250    
Redemption value treated as dividend     $ 230,315    
Series A Preferred Stock | Minimum          
Temporary Equity [Line Items]          
Redemption Price (per share)     $ 3,950.33    
Series A Preferred Stock | Maximum          
Temporary Equity [Line Items]          
Redemption Price (per share)     $ 4,610.68    
EFT Source | Series A Preferred Stock          
Temporary Equity [Line Items]          
Shares issued for acquisition (in shares)       549  
Shares issued, value per share       $ 3,733.88