Non-controlling Interests (Components Of Income Attributable To Non-controlling Interest) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Net income (loss) attributable to noncontrolling interests in consolidated subsidiaries	$ (657)	$ (74)	$ 132
Australia Country Cinemas, Pty Ltd [Member]
Noncontrolling Interest [Line Items]
Net income (loss) attributable to noncontrolling interests in consolidated subsidiaries	(158)	117	157
Shadow View Land And Farming, LLC [Member]
Noncontrolling Interest [Line Items]
Net income (loss) attributable to noncontrolling interests in consolidated subsidiaries	(69)	(99)	(56)
Sutton Hill Properties, LLC [Member]
Noncontrolling Interest [Line Items]
Net income (loss) attributable to noncontrolling interests in consolidated subsidiaries	$ (430)	$ (92)	$ 31