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Employee Benefits and Share-Based Compensation - Performance Based Restricted Stock Unit Activity (Details) - 2009 Plan - Performance Shares [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Number of Shares    
Outstanding at December 31, 2015 (in shares) 151  
Granted (in shares) 122  
Vested (in shares) (52)  
Canceled (in shares) 0  
Outstanding and unvested at June 30, 2016 (in shares) 221  
Weighted-Average Grant Date Fair Value Per Share    
Outstanding and unvested (in dollars per share) $ 23.33  
Granted (in dollars per share) 24.66 $ 29.56
Vested (in dollars per share) 23.04  
Canceled (in dollars per share) 0.00  
Outstanding and unvested (in dollars per share) $ 24.13  
Unrecognized compensation cost $ 2.6  
Weighted average period of compensation cost recognized 1 year 6 months