Leases (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Finance lease obligation	$ 4,359	$ 4,540
Finance lease right-of-use assets	6,079	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, amortization	$ 3,800	$ 3,800