Description Of Business And Segment Reporting (Summary Of Results Of Operations For Principal Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 46,809	$ 65,055	$ 91,861	$ 110,861
Segment operating income (loss)	(7,692)	1,789	(15,222)	(6,094)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	46,809	65,054	91,861	110,861
Segment operating income (loss)	(3,663)	5,760	(6,938)	2,150
Intersegment Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(1,146)	(1,218)	(2,298)	(2,463)
Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	42,942	61,055	84,213	103,042
Segment operating income (loss)	(4,609)	4,474	(8,775)	(141)
Real Estate [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	5,013	5,217	9,946	10,282
Segment operating income (loss)	$ 946	$ 1,286	$ 1,837	$ 2,291