Leases Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 594	$ 596	$ 1,210	$ 1,194
Short-term lease cost	256	276	511	552
Variable cost	171	46	249	95
Sublease income	(52)	(52)	(104)	(104)
Total lease cost	$ 969	$ 866	$ 1,866	$ 1,737