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Employee Benefits and Share-Based Compensation - Restricted Stock Activity (Details) - 2009 Plan - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Number of Shares      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 23.23    
Restricted Stock Units (RSUs)      
Number of Shares      
Outstanding at December 31, 2015 (in shares) 417    
Granted (in shares) 90    
Vested (in shares) (23)    
Forfeited (in shares) (7)    
Outstanding and unvested at March 31, 2016 (in shares) 477   417
Expected to vest after March 31, 2016 (in shares) 419    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 28.39    
Weighted-Average Grant Date Fair Value      
Outstanding and unvested (in dollars per share) 28.49    
Granted (in dollars per share) 27.77 $ 33.97  
Vested (in dollars per share) 25.76    
Forfeited (in dollars per share) 28.42    
Outstanding and unvested (in dollars per share) $ 28.49   $ 28.49
Weighted-average remaining years, expected to vest after March 31, 2016 (in years) 1 year 5 months    
Weighted-average remaining years, outstanding and unvested (in years) 1 year 6 months   1 year 7 months
Aggregate Intrinsic Value      
Outstanding and unvested at March 31, 2016 $ 13,292    
Expected to vest after March 31, 2016 11,677    
Unrecognized compensation expense $ 10,700    
Restricted Stock Awards      
Number of Shares      
Outstanding at December 31, 2015 (in shares) 31    
Granted (in shares) 0    
Vested (in shares) 0    
Forfeited (in shares) 0    
Outstanding and unvested at March 31, 2016 (in shares) 31   31
Weighted-Average Grant Date Fair Value      
Outstanding and unvested (in dollars per share) $ 35.98    
Granted (in dollars per share) 0.00    
Vested (in dollars per share) 0.00    
Forfeited (in dollars per share) 0.00    
Outstanding and unvested (in dollars per share) $ 35.98   $ 35.98
Aggregate Intrinsic Value      
Unrecognized compensation expense $ 100    
Weighted average period of compensation cost recognized 2 months 24 days