Share-Based Compensation - Stock Option Information Related to Equity Incentive Plan (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Options
Outstanding, beginning of period (in shares) | shares	625,407
Granted (in shares) | shares	124,091
Exercised (in shares) | shares	(173,536)
Forfeited (in shares) | shares	(15,931)
Expired (in shares) | shares	(1,030)
Outstanding, end of period (in shares) | shares	559,001
Vested and expected to vest (in shares) | shares	538,524
Exercisable (in shares) | shares	276,191
Weighted average exercise price
Outstanding, beginning of period (usd per share) | $ / shares	$ 169.33
Granted (usd per share) | $ / shares	187.59
Exercised (usd per share) | $ / shares	106.42
Forfeited (usd per share) | $ / shares	232.60
Expired (usd per share) | $ / shares	71.11
Outstanding, end of period (usd per share) | $ / shares	191.29
Vested and expected to vest (usd per share) | $ / shares	190.30
Exercisable (usd per share) | $ / shares	$ 157.07
Weighted Average Remaining Contractual Life in Years
Outstanding (in years)	4 years 3 days
Vested and expected to vest (in years)	3 years 11 months 8 days
Exercisable (in years)	2 years 5 months 19 days
Aggregate Intrinsic Value of In-The-Money Options
Outstanding | $	$ 109,865,324
Vested and expected to vest | $	106,375,308
Exercisable | $	$ 63,734,604