Other Liabilities (Summary Of Other Liabilities Including Pension) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Aug. 29, 2014
Other Liabilities [Abstract]
Lease liability	$ 5,900		$ 5,900
Liability for demolition costs	2,621		2,630
Accrued pension	684		684
Security deposit payable	85		84
Finance lease liability	145
Other	208		7
Other current liabilities	9,643		9,305
Straight-line rent			16,362
Lease make-good provision	5,998		5,614
Accrued pension	4,671		4,670	$ 7,500
Environmental reserve	1,656		1,656
Deferred revenue - real estate	6		32
Acquired leases	42		91
Finance lease liabilities	144
Other	8		506
Other liabilities	$ 12,525	$ 12,898	$ 28,931