Stock Option Summary (Details) - Share-based Payment Arrangement, Option [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
[Line Items]
Outstanding, beginning balance (in shares)	433	458	458
Outstanding, beginning balance, weighted average exercise price per share (in dollars per share)	$ 61.95	$ 56.38	$ 56.38
Outstanding, weighted average remaining contractual life	6 years 8 months 12 days	7 years 6 months	6 years 10 months 24 days	7 years
Outstanding, beginning balance, aggregate intrinsic value	$ 14,697	$ 12,641	$ 12,641
Granted (in shares)	0	73
Granted, weighted average exercise price (in dollars per share)		$ 87.27
Granted, weighted average grant date fair value		$ 26.72
Exercised (in shares)	(24)	(40)
Exercised, weighted average exercise price (in dollars per share)	$ 67.04	$ 54.03
Exercised, aggregate intrinsic value	$ 926	$ 934
Forfeited (in share)	(4)	0
Forfeited, weighted average grant date fair value (in dollars per share)	$ 80.90
Expired (in shares)		0
Expired weighted average exercise price (in dollars per share)
Outstanding, ending balance (in shares)	405	491	433	458
Outstanding, ending balance, weighted average exercise price per share (in dollars per share)	$ 61.48	$ 61.13	$ 61.95	$ 56.38
Outstanding, weighted average remaining contractual life	6 years 8 months 12 days	7 years 6 months	6 years 10 months 24 days	7 years
Outstanding, ending balance, aggregate intrinsic value	$ 11,012	$ 3,106	$ 14,697	$ 12,641
Exercisable (in shares)	295
Exercisable, weighted average exercise price (in dollars per share)	$ 55.03
Exercisable, weighted average remaining contractual term	5 years 10 months 24 days
Exercisable, aggregate intrinsic value	$ 9,930