Leases (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Sale-type and direct finance leases, net selling loss	$ 2,600
Operating Lease, Weighted Average Remaining Lease Term	3 years
Operating Lease, Weighted Average Discount Rate, Percent	3.70%
Current operating lease liabilities	$ 2,400
Operating Lease, Liability	7,163
Noncurrent operating lease liabilities	4,700
Operating Lease, Payments	$ 2,400
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Other Non-Current Assets [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	$ 6,200