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Employee Benefits and Share-Based Compensation - Stock Option Activity (Details) - 2009 Plan [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Number of Shares          
Outstanding at December 31, 2014 (in shares)     2,672    
Granted (in shares)     322    
Exercised (in shares)     (494)    
Expired (in shares)     (2)    
Forfeited (in shares)     (81)    
Outstanding at September 30, 2015 (in shares) 2,417   2,417   2,672
Exercisable at September 30, 2015 (in shares) 1,368   1,368    
Vested and expected to vest at September 30, 2015 (in shares) 2,390   2,390    
Weighted Average Exercise Price          
Outstanding at December 31, 2014 (in dollars per share)     $ 19.02    
Granted (in dollars per share)     34.90    
Exercised (in dollars per share)     15.90    
Expired (in dollars per share)     15.72    
Forfeited (in dollars per share)     23.82    
Outstanding at September 30, 2015 (in dollars per share) $ 21.61   21.61   $ 19.02
Exercisable at September 30, 2015 (in dollars per share) 16.73   16.73    
Vested and expected to vest at September 30, 2015 (in dollars per share) $ 21.50   $ 21.50    
Weighted-average remaining years, outstanding (in years)     6 years 6 months   6 years 6 months
Weighted-average remaining years, exercisable at December 31, 2014 (in years)     4 years 9 months 30 days    
Weighted-average remaining years, vested and expected to vest at September 30, 2015 (in years)     6 years 4 months 24 days    
Aggregate Intrinsic Value, outstanding at September 30, 2015 $ 24,341   $ 24,341    
Aggregate Intrinsic Value, exercisable at September 30, 2015 19,660   19,660    
Aggregate Intrinsic Value, vested and expected to vest at September 30, 2015 $ 24,293   $ 24,293    
Employee Stock Option [Member]          
Weighted Average Exercise Price          
Weighted-average fair value (in dollars per share) $ 10.51 $ 8.51 $ 10.57 $ 8.78  
Intrinsic value of options exercised $ 3,100 $ 2,500 $ 9,700 $ 10,400  
Unrecognized compensation cost of unvested stock options $ 9,000   $ 9,000    
Weighted average period of compensation cost recognized     2 years 8 months 12 days