Leases Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 604	$ 594	$ 1,814	$ 1,788
Short-term lease cost	257	252	768	804
Variable cost	104	77	353	172
Sublease income	(52)	(52)	(156)	(156)
Total lease cost	$ 913	$ 871	$ 2,779	$ 2,608