Pension And Other Liabilities (Summary Of Other Liabilities Including Pension) (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Aug. 29, 2014
Other Liabilities [Abstract]
Liability for demolition costs		$ 2,928	$ 2,745
Accrued pension	[1]	684	684
Security deposit payable		132	114
Finance lease liabilities		49	93
Other		33	17
Other current liabilities		3,826	3,653
Accrued pension		4,048	4,469			$ 7,500
Lease make-good provision		7,408	6,667		$ 5,614
Deferred rent liability		2,897
Environmental reserve		1,656	1,656
Lease liability	[2]	5,900	5,900
Acquired leases		31	37
Finance lease liabilities		69	116
Other		8	9
Other non-current liabilities		$ 22,017	$ 18,854	$ 12,898

[1] Represents the pension liability associated with the Supplemental Executive Retirement Plan explained below.

[2] Represents the lease liability of the option associated with the ground lease purchase of the Village East Cinema. See below for more information.