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Pension And Other Liabilities (Summary Of Other Liabilities Including Pension) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Aug. 29, 2014
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Other Liabilities [Abstract] |  |  |  |
Liability for demolition costs |  | $ 2,783 |  |
Accrued pension | $ 684 | 684 |  |
Security deposit payable | 68 | 69 |  |
Finance lease liabilities | 28 | 40 |  |
Other | 33 | 43 |  |
Other current liabilities | 813 | 3,619 |  |
Lease make-good provision | 6,131 | 7,766 | $ 7,408 |
Accrued pension | 3,138 | 3,605 |  | $ 7,500
Deferred rent liability | 2,484 | 3,930 |  |
Environmental reserve | 1,656 | 1,656 |  |
Lease liability | 5,900 | 5,900 |  |
Acquired leases | 11 | 21 |  |
Finance lease liabilities |  | 28 |  |
Other non-current liabilities | $ 19,320 | $ 22,906 |  |

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