Share-Based Compensation - Share-Based Payment Award Activity (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Options
Outstanding, beginning of period, in shares | shares	625,407
Granted, in shares | shares	1,316
Exercised, in shares | shares	(50,733)
Forfeited, in shares | shares	(2,399)
Outstanding, end of period, in shares | shares	573,591
Vested and expected to vest, end of period, in shares | shares	560,684
Exercisable, end of period, in shares | shares	310,688
Weighted Average Exercise Price
Outstanding, beginning of period, in usd per share | $ / shares	$ 169.33
Granted, in usd per share | $ / shares	244.69
Exercised, in usd per share | $ / shares	85.32
Forfeited, in usd per share | $ / shares	224.87
Outstanding, end of period, in usd per share | $ / shares	176.70
Vested and expected to vest, end of period, in usd per share | $ / shares	174.94
Exercisable, end of period, in usd per share | $ / shares	$ 131.01
Weighted Average Remaining Contractual Life - in Years
Outstanding, end of period	3 years 7 months 17 days
Vested and expected to vest, end of period	3 years 6 months 29 days
Exercisable, end of period	2 years 4 months 2 days
Aggregate Intrinsic Value of In-The-Money Options
Outstanding, end of period | $	$ 11,973,716
Vested and expected to vest, end of period | $	11,967,072
Exercisable, end of period | $	$ 10,376,626