Share-Based Compensation - Option Rollforward (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll [Forward]
Beginning Balance	110,336
Options Granted	25,250	49,115	51,610	35,842
Options Exercised	(22,540)
Options Forfeited	(3,362)
Ending Balance	109,684	110,336
Options Expected to Vest	67,680
Options Exerciseable	42,004
Weighted Average Exercise Price [Abstract]
Outstanding at beginning of year	$ 143.51
Options Granted	245.17
Options Exercised	143.49
Options Forfeited	190.65
Outstanding at End of Period	165.47	$ 143.51
Options Expected to Vest	178.10
Options Exerciseable	$ 145.12
Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term, Outstanding	4 years 9 months 18 days
Weighted Average Remaining Contractual Term, Expected to Vest	5 years 4 months 24 days
Weighted Average Remaining Contractual Term, Exercisable	3 years 10 months 24 days
Outstanding Options, Intrinsic Value	$ 7,550
Expected to Vest Options, Intrinsic Value	3,929
Exercisable Options, Intrinsic Value	$ 3,621