Leases (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Finance lease obligation	$ 4,350	$ 4,540
Finance lease right-of-use assets	6,125	6,280
Germany
Lessee, Lease, Description [Line Items]
Finance lease obligation	4,400	4,500
Finance lease right-of-use assets	6,100	6,300
Finance lease right-of-use asset, accumulated amortization	$ 3,900	$ 3,800