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, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
[Line Items]
Outstanding, beginning balance (in shares)	458	895	895
Outstanding, beginning balance, weighted average exercise price per share (in dollars per share)	$ 56.38	$ 47.93	$ 47.93
Outstanding, weighted average remaining contractual life	7 years 6 months	6 years	7 years	6 years 2 months 12 days
Outstanding, beginning balance, aggregate intrinsic value	$ 12,641	$ 4,806	$ 4,806
Granted (in shares)	73
Granted, weighted average exercise price (in dollars per share)	$ 87.27
Granted, weighted average grant date fair value	$ 26.72
Exercised (in shares)	(40)	(20)
Exercised, weighted average exercise price (in dollars per share)	$ 54.03	$ 44.99
Exercised, aggregate intrinsic value	$ 934	$ 211
Forfeited (in share)		(7)
Forfeited, weighted average grant date fair value (in dollars per share)		$ 67.53
Outstanding, ending balance (in shares)	491	868	458	895
Outstanding, ending balance, weighted average exercise price per share (in dollars per share)	$ 61.13	$ 47.83	$ 56.38	$ 47.93
Outstanding, weighted average remaining contractual life	7 years 6 months	6 years	7 years	6 years 2 months 12 days
Outstanding, ending balance, aggregate intrinsic value	$ 3,106	$ 4,402	$ 12,641	$ 4,806
Exercisable (in shares)	295
Exercisable, weighted average exercise price (in dollars per share)	$ 49.74
Exercisable, weighted average remaining contractual term	6 years 3 months 18 days
Exercisable, aggregate intrinsic value	$ 3,096