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				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Costs and expenses	$ 70,279		$ 75,648		$ 133,131	$ 145,827
Depreciation and amortization	5,572		5,626		11,166	10,877
General and administrative	6,034		7,165		12,518	14,761
Interest expense, net	2,204		1,790		4,054	3,384
Income tax (benefit) expense	1,654		1,965		612	3,135
Net income (loss)	2,357	$ (2,097)	5,129	$ 3,104	260	8,232
Operating property, net	255,761				255,761		$ 258,037	$ 257,667
Intangible assets, net	3,659				3,659		3,827	7,369
Operating lease right-of-use assets	224,878				224,878		232,319
Deferred tax asset, net	26,336				26,336		26,317	26,235
Other current liabilities	9,643				9,643			9,305
Operating lease liabilities - current	19,658				19,658		245,280
Other non-current liabilities	12,525				12,525		12,898	28,931
Operating lease liabilities - non-current portion	218,610				218,610
Retained earnings	47,957				47,957		$ 47,644	$ 47,616
Balance Without Adoption Of ASC 842 [[Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization	5,532				11,084
General and administrative	6,077				12,605
Interest expense, net	2,198				4,047
Income tax (benefit) expense	1,638				597
Net income (loss)	2,334				230
Operating property, net	255,522				255,522
Intangible assets, net	7,031				7,031
Deferred tax asset, net	26,269				26,269
Other current liabilities	9,735				9,735
Other non-current liabilities	28,886				28,886
Retained earnings	47,927				47,927
Effect Of Change Higher/(Lower) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization	40				82
General and administrative	(43)				(87)
Interest expense, net	6				7
Income tax (benefit) expense	16				15
Net income (loss)	23				30
Operating property, net	239				239
Intangible assets, net	(3,372)				(3,372)
Operating lease right-of-use assets	224,878				224,878
Deferred tax asset, net	67				67
Other current liabilities	(92)				(92)
Operating lease liabilities - current	19,658				19,658
Other non-current liabilities	(16,361)				(16,361)
Operating lease liabilities - non-current portion	218,610				218,610
Retained earnings	30				30
Cinema [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Costs and expenses	56,235		$ 60,306		104,564	$ 115,254
Cinema [Member] | Balance Without Adoption Of ASC 842 [[Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Costs and expenses	56,277				104,611
Cinema [Member] | Effect Of Change Higher/(Lower) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Costs and expenses	$ (42)				$ (47)