Other Liabilities (Summary Of Other Liabilities Including Pension) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Aug. 29, 2014
Other Liabilities [Abstract]
Lease liability	$ 5,900
Liability for demolition costs		$ 2,783
Accrued pension	684	684
Security deposit payable	67	69
Finance lease liabilities	33	40
Other	33	43
Other current liabilities	6,717	3,619
Lease make-good provision	7,367	7,766
Accrued pension	3,257	3,605	$ 7,500
Deferred rent liability	2,901	3,930
Environmental reserve	1,656	1,656
Lease liability		5,900
Acquired leases	12	21
Finance lease liabilities	3	28
Other non-current liabilities	$ 15,196	$ 22,906