Stock Option Summary (Details) - Share-based Payment Arrangement, Option [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 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 3 months 18 days	5 years 9 months 18 days	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)	(47)	(59)
Exercised, weighted average exercise price (in dollars per share)	$ 51.52	$ 40.57
Exercised, aggregate intrinsic value	$ 1,131	$ 1,057
Forfeited (in share)		(8)
Forfeited, weighted average grant date fair value (in dollars per share)		$ 67.38
Expired (in shares)		(9)
Expired weighted average exercise price (in dollars per share)		$ 66.36
Outstanding, ending balance (in shares)	484	819	458	895
Outstanding, ending balance, weighted average exercise price per share (in dollars per share)	$ 61.48	$ 48.06	$ 56.38	$ 47.93
Outstanding, weighted average remaining contractual life	7 years 3 months 18 days	5 years 9 months 18 days	7 years	6 years 2 months 12 days
Outstanding, ending balance, aggregate intrinsic value	$ 4,871	$ 12,958	$ 12,641	$ 4,806
Exercisable (in shares)	292
Exercisable, weighted average exercise price (in dollars per share)	$ 50.30
Exercisable, weighted average remaining contractual term	6 years 1 month 6 days
Exercisable, aggregate intrinsic value	$ 4,823