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Other Liabilities (Summary Of Other Liabilities Including Pension) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Aug. 29, 2014
--- | --- | --- | ---
Other Liabilities [Abstract] |  |  |
Liability for demolition costs | $ 2,844 | $ 2,928 |
Accrued pension | 684 | 684 |
Security deposit payable | 132 | 132 |
Finance lease liabilities | 49 | 49 |
Other | 33 | 33 |
Other current liabilities | 3,742 | 3,826 |
Lease make-good provision | 7,416 | 7,408 |
Accrued pension | 3,940 | 4,048 | $ 7,500
Deferred rent liability | 2,827 | 2,897 |
Environmental reserve | 1,656 | 1,656 |
Lease liability | 5,900 | 5,900 |
Acquired leases | 29 | 31 |
Finance lease liabilities | 56 | 69 |
Other |  | 8 |
Other non-current liabilities | $ 21,824 | $ 22,017 |

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