Leases (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Finance lease obligation	$ 4,637	$ 5,077
Finance lease right-of-use assets	6,618	7,017
Germany
Lessee, Lease, Description [Line Items]
Finance lease obligation	4,200	4,500
Finance lease right-of-use assets	6,200	6,500
Finance lease right-of-use asset, accumulated amortization	$ 4,300	$ 4,500