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Employee Benefit Plans - Summary of changes in non vested restricted shares (Details 9) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shares      
Non-vested shares at January 1 2,736,365 3,217,075  
Granted 522,800 563,065  
Vested (750,880) (900,051)  
Forfeited (156,135) (143,724)  
Non-vested shares at December 31 2,352,150 2,736,365 3,217,075
Weighted Average Grant-Date Fair Value      
Non-vested shares at January 1 $ 14.50 $ 12.91  
Granted 25.13 21.66 $ 10.77
Vested 13.06 13.34  
Forfeited 17.10 14.25  
Non-vested shares at December 31 $ 17.15 $ 14.50 $ 12.91