Investments In Unconsolidated Joint Ventures (Summary Of Equity Earnings From Investments In Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]
Total equity earnings	$ 78	$ 34
Mt. Gravatt Cinema [Member]
Schedule of Equity Method Investments [Line Items]
Total equity earnings	92	90
Rialto Cinemas [Member]
Schedule of Equity Method Investments [Line Items]
Total equity earnings	$ (14)	$ (56)