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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 36,033	$ 3,422	$ 57,339	$ 52,650
Segment operating income (loss)	(12,532)	(22,195)	(26,510)	(29,235)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	36,033	3,422	57,339	52,650
Segment operating income (loss)	(8,399)	(18,061)	(18,044)	(20,528)
Intersegment Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(130)	(98)	(261)	(1,782)
Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	32,715	1,217	50,829	47,527
Segment operating income (loss)	(7,345)	(17,254)	(15,621)	(19,908)
Real Estate [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	3,448	2,303	6,771	6,905
Segment operating income (loss)	$ (1,054)	$ (807)	$ (2,423)	$ (620)