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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 3,422	$ 76,009	$ 52,650	$ 137,501
Segment operating income (loss)	(22,195)	5,730	(29,235)	4,370
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	3,422	76,009	52,650	137,501
Segment operating income (loss)	(18,061)	10,527	(20,528)	14,269
Intersegment Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(98)	(1,851)	(1,782)	(3,716)
Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	1,217	72,296	47,527	130,223
Segment operating income (loss)	(17,254)	9,182	(19,908)	11,767
Real Estate [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	2,303	5,564	6,905	10,994
Segment operating income (loss)	$ (807)	$ 1,345	$ (620)	$ 2,502