Leases (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Finance lease obligation	$ 4,540	$ 5,049
Finance lease right-of-use assets	6,280	6,750
Operating lease right-of-use assets	4,656	0
Operating lease, liability	4,677	0
Germany
Lessee, Lease, Description [Line Items]
Finance lease obligation	4,500	5,000
Finance lease right-of-use assets	6,300	6,700
Finance lease, right-of-use asset, amortization	3,800	$ 3,500
Cumulative-effect adjustment for lease accounting
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets			$ 6,200
Operating lease, liability			$ 6,200
Additional operating lease asset recognized	800
Additional operating lease liability recognized	800
Scenario, Adjustment
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	7,000
Operating lease, liability	$ 7,000