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Employee Benefits and Share-Based Compensation - Performance Based Restricted Stock Unit Activity (Details) - 2009 Plan [Member] - Performance Shares [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Number of Shares    
Outstanding at December 31, 2014 (in shares) 233  
Granted (in shares) 60  
Vested (in shares) (70)  
Canceled (in shares) (27)  
Outstanding and unvested at September 30, 2015 (in shares) 196  
Weighted-Average Grant Date Fair Value Per Share    
Outstanding and unvested (in dollars per share) $ 17.96  
Granted (in dollars per share) 29.56 $ 14.36
Vested (in dollars per share) 18.91  
Canceled (in dollars per share) 14.69  
Outstanding and unvested (in dollars per share) $ 21.63  
Fair value of restricted stock units $ 2.6 $ 2.1
Unrecognized compensation cost $ 2.0  
Weighted average period of compensation cost recognized 1 year 1 month 24 days