Leases (Lease Costs) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 1,094	$ 2,188
Variable lease costs	229	437
Total lease costs	1,323	2,625
Land [Member]
Lessee, Lease, Description [Line Items]
Operating lease costs	973	1,946
Variable lease costs	141	278
Total lease costs	1,114	2,224
Building [Member]
Lessee, Lease, Description [Line Items]
Operating lease costs	121	242
Variable lease costs	88	159
Total lease costs	$ 209	$ 401