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Employee Benefits and Share-Based Compensation - Performance Based Restricted Stock Unit Activity (Details) - 2009 Plan - Performance Shares - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Number of Shares    
Outstanding at beginning of period (in shares) 184  
Granted (in shares) 146  
Vested (in shares) (69)  
Canceled (in shares) 0  
Outstanding and unvested at end of period (in shares) 261  
Weighted-Average Grant Date Fair Value Per Share    
Outstanding and unvested (in dollars per share) $ 24.89  
Granted (in dollars per share) 33.89 $ 24.66
Vested (in dollars per share) 24.43  
Canceled (in dollars per share) 0.00  
Outstanding and unvested (in dollars per share) $ 30.06  
Unrecognized compensation cost $ 3.5  
Weighted average period of compensation cost not yet recognized (in years) 1 year 3 months 18 days