Summary Of Significant Accounting Policies (Balance With And Without The Adoption Of ASC 842 On The Statements Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expense	$ (67,546)			$ (69,722)			$ (200,677)	$ (215,546)
Depreciation and amortization	5,704			5,829			16,870	16,705
General and administrative	5,908			6,489			18,426	21,250
Interest expense, net	1,871			1,748			5,924	5,132
Income tax benefit (expense)	547			1,482			1,159	4,618
ProfitLoss	852	$ 2,357	$ (2,097)	1,259	$ 5,128	$ 3,104	1,112	9,493
Operating property, net	248,100						248,100		$ 258,037	$ 257,667
Intangible assets	3,607						3,607		3,827	7,369
Operating lease right-of-use assets	216,963						216,963		232,319
Deferred tax asset, net	25,959						25,959		26,317	26,235
Other current liabilities	9,339						9,339			9,305
Operating lease liabilities - current	19,579						19,579		245,280
Other non-current liabilities	12,330						12,330		12,898	28,931
Operating lease liabilities - non-current	210,737						210,737
Retained earnings	48,859						48,859		$ 47,644	$ 47,616
Balance Without Adoption Of ASC 842 [[Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization	5,665						16,749
General and administrative	5,949						18,554
Interest expense, net	1,867						5,914
Income tax benefit (expense)	535						1,132
ProfitLoss	829						1,058
Operating property, net	247,939						247,939
Intangible assets	6,894						6,894
Deferred tax asset, net	25,904						25,904
Other current liabilities	9,459						9,459
Other non-current liabilities	28,727						28,727
Retained earnings	48,805						48,805
Effect Of Change Higher/(Lower) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization	39						121
General and administrative	(41)						(128)
Interest expense, net	4						10
Income tax benefit (expense)	12						27
ProfitLoss	23						54
Operating property, net	161						161
Intangible assets	(3,287)						(3,287)
Operating lease right-of-use assets	216,963						216,963
Deferred tax asset, net	55						55
Other current liabilities	(120)						(120)
Operating lease liabilities - current	19,579						19,579
Other non-current liabilities	(16,397)						(16,397)
Operating lease liabilities - non-current	210,737						210,737
Retained earnings	54						54
Cinema [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expense	(53,709)			$ (54,929)			(158,273)	$ (170,183)
Cinema [Member] | Balance Without Adoption Of ASC 842 [[Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expense	(53,746)						(158,357)
Cinema [Member] | Effect Of Change Higher/(Lower) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expense	$ 37						$ 84