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Pension And Other Liabilities (Summary Of Other Liabilities Including Pension) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Aug. 29, 2014
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Other Liabilities [Abstract] |  |  |  |
Liability for demolition costs | $ 2,783 | $ 2,928 |  |
Accrued pension | 684 | 684 |  |
Security deposit payable | 69 | 132 |  |
Finance lease liabilities | 40 | 49 |  |
Other | 43 | 33 |  |
Other current liabilities | 3,619 | 3,826 |  |
Accrued pension | 3,605 | 4,048 |  | $ 7,500
Lease make-good provision | 7,766 | 7,408 | $ 6,667 |
Deferred rent liability | 3,930 | 2,897 |  |
Environmental reserve | 1,656 | 1,656 |  |
Lease liability | 5,900 | 5,900 |  |
Acquired leases | 21 | 31 |  |
Finance lease liabilities | 28 | 69 |  |
Other |  | 8 |  |
Other non-current liabilities | $ 22,906 | $ 22,017 |  |

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