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Other Liabilities (Summary Of Other Liabilities Including Pension) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Aug. 29, 2014
--- | --- | --- | ---
Other Liabilities [Abstract] |  |  |
Lease liability | $ 5,900 |  |
Liability for demolition costs | 2,623 | $ 2,745 |
Accrued pension | 684 | 684 |
Security deposit payable | 109 | 114 |
Finance lease liabilities | 51 | 93 |
Other | 33 | 17 |
Other current liabilities | 9,400 | 3,653 |
Lease make-good provision | 6,716 | 6,667 |
Accrued pension | 4,261 | 4,469 | $ 7,500
Environmental reserve | 1,656 | 1,656 |
Lease liability |  | 5,900 |
Acquired leases | 32 | 37 |
Finance lease liabilities | 92 | 116 |
Other | 978 | 9 |
Other liabilities | $ 13,735 | $ 18,854 |

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