Pension And Other Liabilities (Summary Of Other Liabilities Including Pension) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Aug. 29, 2014
Pension And Other Liabilities [Abstract]
Lease liability	$ 5,900	$ 5,900
Accrued pension	500	684
Security deposit payable	117	74
Finance lease liabilities	43	40
Other	33	33
Other current liabilities	6,593	6,731
Accrued pension	2,312	2,646		$ 7,500
Lease make-good provision	5,908	6,050	$ 6,131
Deferred rent liability	3,786	1,314
Environmental reserve	1,656	1,656
Acquired leases		2
Finance lease liabilities		43
Other non-current liabilities	$ 13,662	$ 11,711