Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Statements Of Operations) (Details) - USD ($)	3 Months Ended										12 Months Ended
	Dec. 31, 2016		Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Revenue	$ 67,451,000	[1]	$ 71,315,000	$ 66,918,000	$ 64,789,000	$ 66,691,000	[1]	$ 57,788,000	$ 72,802,000	$ 60,584,000	$ 270,473,000		$ 257,865,000	[2],[3]	$ 255,242,000	[2],[3]
Operating expense											(250,162,000)		(234,169,000)	[3]	(232,575,000)	[3]
Operating income											20,311,000		23,696,000	[3]	22,667,000	[3]
Interest expense (net), casualty loss and others											(7,873,000)		3,279,000		(7,329,000)
Income before income taxes and equity earnings of unconsolidated joint ventures											12,438,000		26,975,000	[3],[4]	15,338,000	[3],[4]
Equity earnings of unconsolidated joint ventures											999,000		1,204,000	[3]	1,015,000	[3]
Income before income taxes											13,437,000		28,179,000	[3]	16,353,000	[3]
Income tax benefit (expense)											(4,020,000)		(5,148,000)	[3],[4]	8,925,000	[3],[4]
Net income	$ 354,000	[1]	$ 3,917,000	$ 2,922,000	$ 2,224,000	$ 3,595,000	[1]	$ 328,000	$ 16,006,000	$ 3,102,000	$ 9,417,000	[3]	$ 23,031,000	[3]	$ 25,278,000	[3]
Basic EPS	$ 0.01	[1]	$ 0.17	$ 0.13	$ 0.09	$ 0.14	[1]	$ 0.02	$ 0.69	$ 0.14	$ 0.40		$ 0.99	[3]	$ 1.08	[3],[4]
Diluted EPS	$ 0.02	[1]	$ 0.16	$ 0.13	$ 0.09	$ 0.14	[1]	$ 0.02	$ 0.68	$ 0.14	$ 0.40		$ 0.98	[3]	$ 1.07	[3],[4]
Without Breakage Revenue [Member]
Revenue											$ 269,855,000
Operating expense											(250,162,000)
Operating income											19,693,000
Interest expense (net), casualty loss and others											(7,873,000)
Income before income taxes and equity earnings of unconsolidated joint ventures											11,820,000
Equity earnings of unconsolidated joint ventures											999,000
Income before income taxes											12,819,000
Income tax benefit (expense)											(3,787,000)
Net income											$ 9,032,000
Basic EPS											$ 0.39
Diluted EPS											$ 0.38
Previously Reported [Member]
Revenue													$ 257,323,000		$ 254,748,000
Operating expense													(234,169,000)		(232,575,000)
Operating income													23,154,000		22,173,000
Interest expense (net), casualty loss and others													3,279,000		(7,329,000)
Income before income taxes and equity earnings of unconsolidated joint ventures													26,433,000		14,844,000
Equity earnings of unconsolidated joint ventures													1,204,000		1,015,000
Income before income taxes													27,637,000		15,859,000
Income tax benefit (expense)													(4,943,000)		9,785,000
Net income													$ 22,694,000		$ 25,644,000
Basic EPS													$ 0.98		$ 1.09
Diluted EPS													$ 0.97		$ 1.08
Adjustment [Member]
Revenue											$ 618,000		$ 542,000		$ 494,000	[5]
Operating income											618,000		542,000		494,000	[5]
Income before income taxes and equity earnings of unconsolidated joint ventures											618,000		542,000		494,000	[5]
Income before income taxes											618,000		542,000		494,000	[5]
Income tax benefit (expense)	$ 611,000					$ 514,000					(233,000)		(205,000)		(860,000)	[5]
Net income											$ 385,000		$ 337,000		$ (366,000)	[5]	$ 1,800,000
Basic EPS											$ 0.01		$ 0.01		$ (0.01)	[5]
Diluted EPS											$ 0.02		$ 0.01		$ (0.01)	[5]

[1] Fourth Quarter Results included the impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).

[2] Balances relating to Cinema segment included the restatement impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).

[3] Certain 2015 and 2014 balances included the restatement impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).

[4] 2015 and 2014 balances included the restatement impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).

[5] The income tax effect of $860,000 in 2014 relates to the cumulative breakage revenue as of December 31, 2014. The tax effect of the portion that relates to years prior to 2014 was not recognized until 2014 due to full valuation allowance on our deferred tax assets in the U.S. as of December 31, 2013 and prior.