Pension And Other Liabilities (Narrative) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Aug. 29, 2014
Defined Benefit Plan Disclosure [Line Items]
Total operating property		$ 264,724,000		$ 211,886,000	[1]
Current capital lease liability	[2]	5,900,000		5,900,000
Accrued pension costs		5,228,000	[3]	5,732,000	[3]		$ 7,500,000
Beneift obligation, gross		$ 10,200,000
Discount rate		4.25%
Discount term		15 years
Monthly estate payment amount		$ 56,944
Discounted value		2,700,000
Accumulated prior service cost		$ 3,100,000
Accumulated prior service cost amortization period		15 years
Accrued pension costs included in other liabilities		$ 8,100,000		8,000,000
Service cost				$ 0		$ 0
Sutton Hill Capital, LLC [Member]
Defined Benefit Plan Disclosure [Line Items]
Lease term		10 years
Lease expiration date		Jun. 30, 2020
Purchase option		$ 5,900,000
Total operating property		4,700,000
Current capital lease liability		$ 5,900,000
Cinema Ground Lease [Member]
Defined Benefit Plan Disclosure [Line Items]
Lease expiration date		Jun. 01, 2031
Chief Executive Officer [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated amortization of prior service cost next fiscal year		$ 207,000
Supplemental Executive Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued pension costs							$ 7,600,000

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

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

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