Summary Of Significant Accounting Policies (Narrative) (Details)		3 Months Ended					12 Months Ended
	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($) a		Dec. 31, 2016 USD ($)		Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) a segment		Dec. 31, 2016 USD ($)		Dec. 31, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Restricted cash		$ 17,000		$ 17,000			$ 17,000		$ 17,000
Number of segments | segment							2
Goodwill impairment							$ 0		0		$ 0
Advertising expense							2,300,000		2,300,000		2,300,000
Gains/(losses) on the settlement of litigation							1,800,000		415,000		(495,000)
Income tax expense							(3,337,000)		(4,020,000)	[1]	(5,148,000)	[1]
Deferred tax asset		24,908,000	[2]	28,667,000			24,908,000	[2]	28,667,000
Retained earnings		32,679,000		1,680,000	[3]		32,679,000		1,680,000	[3]
Occupancy cost expense							(9,437,000)		(9,044,000)	[1]	(10,948,000)	[1]
Additional paid in capital		145,898,000		144,569,000	[3]		145,898,000		144,569,000	[3]
Other comprehensive income							39,915,000		9,673,000	[1]	6,877,000	[1]
Other liabilities		26,649,000		30,165,000	[3]		26,649,000		30,165,000	[3]
Previously Reported [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax expense											(4,943,000)
Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax expense				611,000		$ 514,000	(239,000)		(233,000)		(205,000)
Previously reported income tax expenses						1,800,000
Deferred tax asset				611,000		2,116,000			611,000		2,116,000
Retained earnings		369,000		$ 385,000			369,000		385,000
Income tax expense, out of period adjustment						1,286,000
Occupancy cost expense		$ 544,000
Additional paid in capital						793,000					793,000
Other comprehensive income						1,859,000
Other liabilities						$ 1,050,000					1,050,000
Non Income Producing Properties [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment losses							$ 0		$ 0		$ 0
Mt. Gravatt [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage in equity method		33.30%					33.30%
Rialto Cinemas [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage in equity method		50.00%					50.00%
Subsequent Event [Member] | Accounting Standards Update 2014-09 [Member]
Summary Of Significant Accounting Policies [Line Items]
Expected reduction in deferred revenue associated with gift cards and gift certificates	$ 1,300,000
Expected reduction in deferred revenue for the loyalty program accounting	$ 1,000,000
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage in equity method		20.00%					20.00%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage in equity method		50.00%					50.00%
Australian Country Cinemas, Pty Ltd [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage by parent		75.00%					75.00%
Sutton Hill Properties, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage by parent		75.00%					75.00%
Shadow View Land And Farming, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage by parent		50.00%					50.00%
Area of property | a		202					202

[1] Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).

[2] We recorded an adjustment to our federal deferred income tax assets and liabilities as of December 31, 2017 to reflect the reduction in the U.S. statutory federal corporate income tax rate from 35% to 21% resulting from the Tax Act.

[3] Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).