Leases (Components of 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	$ 504	$ 589	$ 1,014	$ 1,214
Amortization of leased assets	9	100	103	196
Interest on lease liabilities	1	3	6	6
Variable lease expense	137	175	287	276
Short-term lease expense	45	89	159	163
Total lease expense	$ 696	$ 956	$ 1,569	$ 1,855