Stock-based Compensation Expense Fixed-Price Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Shares
Outstanding Shares,Beginning Balance (in shares)	599,841
Granted (in shares)	62,479	76,221	95,639
Exercised (in shares)	(302,151)
Outstanding Shares, Ending Balance (in shares)	360,169	599,841
Exercisable, Ending Balance (in shares)	157,724
Weighted-Average Exercise Price
Outstanding Weighted-Average Exercise Price, Beginning Balance (in dollars per share)	$ 73.24
Granted (in dollars per share)	157.21
Exercised (in dollars per share)	60.87
Outstanding Weighted-Average Exercise (in dollars per share) Price, Ending Balance	98.19	$ 73.24
Exercisable Weighted-Average Exercise Price, Ending Balance (in dollars per share)	$ 85.29
Weighted-Average Remaining Contractual Term (Years)
Weighted-Averaged Remaining Contractual Term, Beginning Balance	6 years 7 months 6 days	5 years 7 months 6 days
Weighted-Averaged Remaining Contractual Term, Ending Balance	6 years 7 months 6 days	5 years 7 months 6 days
Exercisable Weighted-Average Remaining Contractual Term, Ending Balance	4 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding Aggregate Intrinsic Value, Beginning Balance	$ 44,554
Outstanding Aggregate Intrinsic Value, Ending Balance	48,833	$ 44,554
Exercisable Aggregate Intrinsic Value, Ending Balance	$ 23,419