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Stock-Based Compensation Plans and Emploiyee Benefits (Restricted Stock Unit Activity) (Details) - Restricted stock units - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of Shares      
Non-vested at Beginning of Period (in shares) 290    
Granted (in shares) 116    
Vested (in shares) (75)    
Forfeited (in shares) (49)    
Non-vested at End of Period (in shares) 282 290  
Weighted Average Grant Date Fair Value Per Share      
Non-vested at Beginning of Period (in dollars per share) $ 11.33    
Granted (in dollars per share) 12.09 $ 10.11 $ 13.65
Vested (in dollars per share) 12.15    
Forfeited (in dollars per share) 13.95    
Non-vested at End of Period (in dollars per share) $ 10.98 $ 11.33  
Fair value of units vested during period $ 900 $ 2,900 $ 100
Non-vested, aggregate intrinsic value $ 3,183 $ 3,578