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Share-Based Compensation - Stock Options Activity (Details) - Stock Option - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Shares    
Beginning balance (in shares) 1,987,946  
Granted (in shares) 440,825  
Exercised (in shares) (360,986)  
Forfeited/Expired (in shares) (47,046)  
Ending balance (in shares) 2,020,739 1,987,946
Vested and expected to vest (in shares) 1,897,772  
Exercisable (in shares) 968,929  
Weighted Average Price    
Beginning Balance, Weighted Average Price (in dollars per share) $ 61.83  
Granted, Weighted Average Price (in dollars per share) 93.40  
Exercised, Weighted Average Price (in dollars per share) 52.58  
Forfeited, Weighted Average Price (in dollars per share) 78.67  
Ending Balance, Weighted Average Price (in dollars per share) $ 69.98 $ 61.83
Weighted-Average Remaining Contractual Term    
Stock options outstanding, Weighted-Average Remaining Contractual Term 6 years 11 months 27 days 6 years 10 months 2 days
Aggregate Intrinsic Value    
Stock options outstanding, Aggregate intrinsic value $ 104,045,261 $ 56,144,876
Vested and expected to vest , Weighted Average Price (in dollars per share) $ 69.00  
Exercisable, Weighted Average Price (in dollars per share) $ 55.72  
Weighted-Average Remaining Contractual Term, Vested and expected to vest 6 years 10 months 17 days  
Weighted-Average Remaining Contractual Term, Exercisable 5 years 4 months 6 days  
Aggregate Intrinsic Value, Vested and expected to vest $ 99,579,316  
Aggregate Intrinsic Value, Exercisable $ 63,709,269