Other Liabilities (Summary Of Other Liabilities Including Pension) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Pension And Other Liabilities [Abstract]
Lease liability	$ 5,900	$ 5,900
Accrued pension	493	684
Security deposit payable	119	74
Finance lease liabilities	42	40
Other	34	33
Other current liabilities	6,588	6,731
Lease make-good provision	6,239	6,050
Accrued pension	2,450	2,646
Deferred rent liability	2,610	1,314
Environmental reserve	1,656	1,656
Acquired leases		2
Finance lease liabilities	12	43
Other non-current liabilities	$ 12,967	$ 11,711