Non-controlling Interests (Components Of Non-controlling Interests) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Non-controlling interests in consolidated subsidiaries	$ 4,267	$ 4,337
Australian Country Cinemas Pty Ltd. [Member]
Noncontrolling Interest [Line Items]
Non-controlling interests in consolidated subsidiaries	27	89
Shadow View Land And Farming, LLC [Member]
Noncontrolling Interest [Line Items]
Non-controlling interests in consolidated subsidiaries	2,156	2,153
Sutton Hill Properties, LLC [Member]
Noncontrolling Interest [Line Items]
Non-controlling interests in consolidated subsidiaries	$ 2,084	$ 2,095