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Employee Benefits and Share-Based Compensation - Performance Based Restricted Stock Units Awards (Details) - 2009 Plan - Performance Shares - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares      
Outstanding and unvested December 31 151    
Granted (Awarded) 123    
Vested (Released) (90)    
Forfeited 0    
Outstanding and unvested at December 31 184 151  
Weighted-Average Grant Date Fair Value      
Outstanding and unvested December 31 $ 23.33    
Granted (Awarded) 24.66 $ 29.56 $ 20.94
Vested (Released) 21.95    
Forfeited 0.00    
Outstanding and unvested at December 31 $ 24.89 $ 23.33  
Weighted average period of compensation cost recognized 1 year 2 months 12 days    
Unrecognized compensation cost $ 1.6 $ 1.5  
Vested in period, fair value $ 2.0 $ 1.9 $ 1.5