Non-controlling Interests (Components Of Non-controlling Interests) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Noncontrolling Interest [Line Items]
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries	$ 3,901	$ 4,267
Australia Country Cinemas, Pty Ltd [Member]
Noncontrolling Interest [Line Items]
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries	32	119
Shadow View Land And Farming, LLC [Member]
Noncontrolling Interest [Line Items]
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries	2,127	2,145
Sutton Hill Properties, LLC [Member]
Noncontrolling Interest [Line Items]
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries	$ 1,742	$ 2,003