Leases (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) renewal_option	Dec. 31, 2018 USD ($)
Leases [Abstract]
Basis spread on discount rate	1.60%
Lessor, Lease, Description [Line Items]
Building accumulated depreciation	$ 8,108	$ 8,223
Land
Lessor, Lease, Description [Line Items]
Lessor, operating lease, term	5 years
Lessor, operating lease, renewal term	5 years
Land | Minimum
Lessor, Lease, Description [Line Items]
Lessor, operating lease, number of renewal options | renewal_option	2
Land | Maximum
Lessor, Lease, Description [Line Items]
Lessor, operating lease, number of renewal options | renewal_option	5
Assets Leased to Others [Member]
Lessor, Lease, Description [Line Items]
Building cost	$ 2,100
Building accumulated depreciation	$ 1,200