Other Liabilities (Summary Of Other Liabilities Including Pension) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016		Aug. 29, 2014
Other Liabilities [Abstract]
Lease liability	$ 5,900	$ 5,900
Liability for demolition costs	2,934	5,914
Accrued pension	2,736	2,223
Security deposit payable	90	77
Other		17
Other current liabilities	11,660	14,131	[1]
Straight-line rent liability	12,759	12,413
Lease make-good provision	5,596	5,146
Accrued pension	5,354	5,732		$ 7,500
Environmental reserve	1,656	1,656
Deferred revenue - real estate	3	4,398
Acquired leases	209	267
Interest rate swap		58
Other	479	495
Other liabilities	$ 26,056	$ 30,165	[1]

[1] Certain 2016 balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).