Share-Based Compensation - Stock Option Information Related to Equity Incentive Plan (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Options
Outstanding, beginning of period (in shares) | shares	679,659
Granted (in shares) | shares	126,945
Exercised (in shares) | shares	(154,897)
Forfeited (in shares) | shares	(25,580)
Expired (in shares) | shares	(720)
Outstanding, end of period (in shares) | shares	625,407
Vested and expected to vest (in shares) | shares	609,849
Exercisable (in shares) | shares	361,503
Weighted average exercise price
Outstanding, beginning of period (usd per share) | $ / shares	$ 137.19
Granted (usd per share) | $ / shares	249.15
Exercised (usd per share) | $ / shares	86.96
Forfeited (usd per share) | $ / shares	213.26
Expired (usd per share) | $ / shares	64.37
Outstanding, end of period (usd per share) | $ / shares	169.33
Vested and expected to vest (usd per share) | $ / shares	167.31
Exercisable (usd per share) | $ / shares	$ 124.70
Weighted Average Remaining Contractual Life in Years
Outstanding (in years)	3 years 7 months 17 days
Vested and expected to vest (in years)	3 years 6 months 29 days
Exercisable (in years)	2 years 4 months 6 days
Aggregate Intrinsic Value of In-The-Money Options
Outstanding | $	$ 55,364,613
Vested and expected to vest | $	55,128,404
Exercisable | $	$ 46,760,360