Summary Of Significant Accounting Policies (Impact Of Adoption Of ASC 842 And ASC 606 On The Statements Of Income And Balance Sheet) (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018		Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019	Jan. 01, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expense											$ (267,645)	$ (285,307)	$ (259,173)
Depreciation and amortization											22,747	22,275	16,942
General and administrative											25,395	27,337	25,347
Interest expense, net											7,904	6,837	6,194
Revenue	$ 68,880	[1]	$ 70,386	$ 76,009	$ 61,493	$ 74,877	[1]	$ 74,150	$ 84,125	$ 75,779	276,768	308,931	279,556
Income tax (benefit) expense											(28,837)	(3,298)	(3,293)
Net income (loss)	(27,458)	[1]	801	2,294	(2,140)	4,926	[1]	1,177	5,028	3,035	(26,503)	14,166	30,876
Operating properties, net	258,138					257,667					258,138	257,667		$ 258,037
Intangible assets	4,320					7,369					4,320	7,369		3,827
Operating lease right-of-use assets	229,879										229,879			232,319
Deferred tax assets, net	3,444					26,444					3,444	26,444		26,526	$ 24,585
Other current liabilities	3,653					9,305					3,653	9,305
Operating lease liabilities - current	20,379										20,379			245,280
Other non-current liabilities	18,854					28,931					18,854	28,931		12,898
Operating lease liabilities - non-current	223,164										223,164
Deferred current revenue	11,324					9,264					11,324	9,264			9,495
Retained earnings	20,647					47,048					20,647	47,048		$ 47,076	$ 33,250
Balance Without Adoption Of ASC 842 [[Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization											22,582
General and administrative											25,569
Interest expense, net											7,891
Income tax (benefit) expense											(28,819)
Net income (loss)											(26,541)
Operating properties, net	257,933										257,933
Intangible assets	7,523										7,523
Deferred tax assets, net	3,380										3,380
Other current liabilities	3,789										3,789
Other non-current liabilities	35,276										35,276
Retained earnings	139,578										139,578
Effect Of Change Higher/(Lower) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization											165
General and administrative											(174)
Interest expense, net											13
Income tax (benefit) expense											(18)
Net income (loss)											38
Operating properties, net	205										205
Intangible assets	(3,203)										(3,203)
Operating lease right-of-use assets	229,879										229,879
Deferred tax assets, net	64										64
Other current liabilities	(136)										(136)
Operating lease liabilities - current	20,379										20,379
Other non-current liabilities	(16,422)										(16,422)
Operating lease liabilities - non-current	223,164										223,164
Retained earnings	38										38
Cinema [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expense											(210,050)	(225,791)	(207,447)
Revenue											262,189	293,723	263,141
Cinema [Member] | Balance Without Adoption Of ASC 842 [[Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expense											(210,110)
Cinema [Member] | Effect Of Change Higher/(Lower) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expense											60
Balances Without Adoption of ASC 606 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax (benefit) expense											(29,014)	(3,234)
Net income (loss)											(26,091)	14,309
Deferred tax assets, net	3,267					26,508					3,267	26,508
Deferred current revenue	10,736					9,471					10,736	9,471
Retained earnings	21,059					46,905					21,059	46,905
Balances Without Adoption of ASC 606 [Member] | Cinema [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue											262,777	293,516
Effect Of Change Higher/(Lower) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax (benefit) expense											(177)	64
Net income (loss)											(412)	143
Deferred tax assets, net	177					(64)					177	(64)
Deferred current revenue	588					(207)					588	(207)
Retained earnings	(412)					143					(412)	143
Effect Of Change Higher/(Lower) [Member] | Cinema [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue											(588)	207
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	68,880	[1]	70,456	76,096	61,551	74,990	[1]	74,261	84,262	75,872
Net income (loss)	(27,458)	[1]	$ 852	$ 2,357	$ (2,097)	5,006	[1]	$ 1,259	$ 5,129	$ 3,104
Operating properties, net	258,138					257,667					258,138	257,667
Intangible assets	4,320					7,369					4,320	7,369
Operating lease right-of-use assets	229,879										229,879
Deferred tax assets, net	3,444					26,444					3,444	26,444	24,746
Other current liabilities	3,653										3,653
Operating lease liabilities - current	20,379										20,379
Other non-current liabilities	18,854					28,931					18,854	28,931
Operating lease liabilities - non-current	223,164										223,164
Deferred current revenue													9,850
Retained earnings	$ 139,616					$ 47,048					$ 139,616	$ 47,048	$ 33,056

[1] Since previously published financial statements have been corrected, there is no impact on the fourth quarter results for 2019 and so no data is displayed here.