Share Incentive Plans - Information Regarding Options Outstanding and Exercisable (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Share Based Compensation [Abstract]
Options Outstanding, Options | shares	5,567,544
Options Exercisable, Options | shares	4,750,481
Options, Vested and expected to vest | shares	808,646
Options Outstanding, Weighted Average Remaining Contractual Life in Years	5 years 3 months 18 days
Options Exercisable, Weighted Average Remaining Contractual Life in Years	4 years 9 months 21 days
Options Vested and expected to vest, Weighted Average Remaining Contractual Life in Years	8 years 1 month 17 days
Options Outstanding, Weighted Average Exercise Price | $ / shares	$ 55.52
Options Exercisable, Weighted Average Exercise Price | $ / shares	54.13
Vested and expected to vest, Weighted Average Exercise Price | $ / shares	$ 63.60
Options Outstanding, Aggregate Intrinsic Value | $	$ 141,395
Options Exercisable, Aggregate Intrinsic Value | $	127,277
Vested and expected to vest, Aggregate Intrinsic Value | $	$ 14,005