Other Liabilities (Summary Of Other Liabilities Including Pension) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Other Liabilities [Abstract]
Lease liability	$ 5,900	$ 5,900
Accrued pension	496	500
Security deposit payable	113	117
Finance lease liabilities	32	43
Other	34	33
Other current liabilities	6,575	6,593
Lease make-good provision	6,074	5,908
Accrued pension	2,181	2,312
Deferred rent liability	3,824	3,786
Environmental reserve	1,656	1,656
Finance lease liabilities	1
Other non-current liabilities	$ 13,736	$ 13,662