Leases (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Right-of-use asset	$ 7,910	$ 7,910	$ 8,700
Operating lease liabilities	8,181	8,181	$ 8,700
Right-of-use asset recognized as non-cash asset addition		800
Cash paid for amounts included in measurement of operating lease liability		1,800
Total operating lease expense	2,000	4,300
Operating lease expense	900	1,800
Operating lease revenues	$ 3,500	$ 6,800
Minimum
Lessee, Lease, Description [Line Items]
Operating leases remaining term, lessee	1 year	1 year
Operating leases remaining term, lessor	2 years	2 years
Maximum
Lessee, Lease, Description [Line Items]
Operating leases remaining term, lessee	11 years	11 years
Operating leases remaining term, lessor	10 years	10 years