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Pension And Other Liabilities (Narrative) (Details) - USD ($) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 12, 2020 | Aug. 28, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 29, 2021 | Jun. 30, 2020 | Jan. 01, 2019 | Aug. 29, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Total operating property |  |  |  | $ 353,125,000 | $ 258,138,000 |  |  | $ 258,037,000 |
Operating lease liabilities - current |  |  |  | 22,699,000 | 20,379,000 |  |  | $ 245,280,000 |
Accrued pension liability |  |  |  | 4,048,000 | 4,469,000 |  |  |  | $ 7,500,000
Benefit 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 |  |  |  | $ 4,700,000 | 5,200,000 |  |  |  |
Service cost |  |  |  | 0 | 0 |  |  |  |
Lease liability | [1] |  |  | $ 5,900,000 | $ 5,900,000 |  |  |  |
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
Village East Cinema [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Lease expiration date |  | Jan. 31, 2022 |  |  |  |  |  |  |
Operating lease liabilities - current |  |  |  | $ 0.0 |  |  |  |  |
Lease term |  |  |  | 13 years |  |  |  |  |
Payment to acquire property |  |  | $ 5,900,000 |  |  |  |  |  |
Village East Cinema [Member] | Sutton Hill Capital, LLC [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Purchase option |  |  |  | $ 5,900,000 |  |  | $ 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] | Sutton Hill Capital, LLC [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Purchase option |  |  |  |  |  | $ 5,900,000 |  |  |
[1] | Represents the lease liability of the option associated with the ground lease purchase of the Village East Cinema. See below for more information.

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