Pension And Other Liabilities (Narrative) (Details) - USD ($)		1 Months Ended	12 Months Ended
	Mar. 12, 2020	Feb. 28, 2018	Dec. 31, 2019		Dec. 31, 2018		Jan. 01, 2019	Aug. 29, 2014
Defined Benefit Plan Disclosure [Line Items]
Total operating property			$ 258,138,000		$ 257,667,000		$ 258,037,000
Operating lease liabilities - current			20,379,000				$ 245,280,000
Accrued pension liability			4,469,000	[1]	4,670,000	[1]		$ 7,500,000
Beneift obligation, gross			$ 10,200,000
Discount rate			4.25%
Discount term			15 years
Monthly estate payment amount			$ 57,000
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			$ 5,200,000		5,400,000
Service cost			0		$ 0
Operating lease liabilities			$ 223,164,000
Payment related to annuity		$ 2,400,000
Payment period			42 months
Sutton Hill Capital, LLC [Member]
Defined Benefit Plan Disclosure [Line Items]
Lease expiration date			Jun. 30, 2020
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 liability								$ 7,600,000
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Lease term			1 year
Village East Cinema [Member]
Defined Benefit Plan Disclosure [Line Items]
Operating lease liabilities - current			$ 0
Lease term			13 years
Village East Cinema [Member] | Sutton Hill Capital, LLC [Member]
Defined Benefit Plan Disclosure [Line Items]
Purchase option			$ 5,900,000
Total operating property			4,700,000
Operating lease liabilities - current			$ 5,900,000
Lease term			10 years
Subsequent Event [Member] | Village East Cinema [Member]
Defined Benefit Plan Disclosure [Line Items]
Lease expiration date	Jan. 31, 2022

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