Leases (Components of 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	$ 499	$ 569	$ 1,513	$ 1,783
Amortization of leased assets	10	104	113	300
Interest on lease liabilities	2	4	8	10
Variable lease expense	157	141	444	416
Short-term lease expense	89	79	248	242
Total lease expense	$ 757	$ 897	$ 2,326	$ 2,751