Leases (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Jan. 01, 2019	Sep. 30, 2019	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Right-of-use asset	$ 8,700	$ 9,883	$ 9,883
Operating lease liabilities	8,700	10,206	10,206
Right-of-use asset recognized as non-cash asset addition	$ 8,700		3,600
Cash paid for amounts included in measurement of operating lease liability			2,700
Total operating lease expense		2,000	6,200
Operating lease expense		900	2,700
Operating lease revenues		$ 3,600	$ 10,400
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