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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
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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.

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