Share Incentive Plans - Information Regarding Options Outstanding and Exercisable (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Share Based Compensation [Abstract]
Options Outstanding, Options | shares	5,642,752
Options Exercisable, Options | shares	4,985,668
Options, Vested and expected to vest | shares	648,552
Options Outstanding, Weighted Average Remaining Contractual Life in Years	4 years 7 months 20 days
Options Exercisable, Weighted Average Remaining Contractual Life in Years	4 years 1 month 28 days
Options Vested and expected to vest, Weighted Average Remaining Contractual Life in Years	8 years 3 months 25 days
Options Outstanding, Weighted Average Exercise Price | $ / shares	$ 56.91
Options Exercisable, Weighted Average Exercise Price | $ / shares	55.12
Vested and expected to vest, Weighted Average Exercise Price | $ / shares	$ 70.40
Options Outstanding, Aggregate Intrinsic Value | $	$ 26,881
Options Exercisable, Aggregate Intrinsic Value | $	26,804
Vested and expected to vest, Aggregate Intrinsic Value | $	$ 77