Leases (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	3 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	4.20%
Current operating lease liabilities	$ 1,200
Operating Lease, Liability	3,003
Noncurrent operating lease liabilities	1,800
Operating Lease, Payments	1,200
Undiscounted Future Operting Lease Payment	$ 6,100
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	6 years
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	3 years
Other Non-Current Assets [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	$ 2,400