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
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Costs and expenses	$ 62,852	$ 70,179
Depreciation and amortization	5,594	5,250
General and administrative	6,484	7,597
Interest expense, net	1,852	1,594
Income tax (benefit) expense	1,042	(1,170)
Net income (loss)	(2,097)	3,104
Operating property, net	257,402		$ 258,037	$ 257,667
Intangible assets, net	3,694		3,827	7,369
Operating lease right-of-use assets	229,266		232,319
Deferred tax asset, net	26,483		26,317	26,235
Other current liabilities	9,525			9,305
Operating lease liabilities - current	19,797		245,280
Other non-current liabilities	12,346		12,898	28,931
Operating lease liabilities - non-current portion	222,594
Retained earnings	45,563		$ 47,644	$ 47,616
Balance Without Adoption Of ASC 842 [[Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization	5,552
General and administrative	6,528
Interest expense, net	1,849
Income tax (benefit) expense	1,041
Net income (loss)	(2,094)
Operating property, net	257,072
Intangible assets, net	7,151
Deferred tax asset, net	26,400
Other current liabilities	9,363
Other non-current liabilities	28,643
Retained earnings	45,585
Effect Of Change Higher/(Lower) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization	42
General and administrative	(44)
Interest expense, net	3
Income tax (benefit) expense	1
Net income (loss)	3
Operating property, net	330
Intangible assets, net	(3,457)
Operating lease right-of-use assets	229,266
Deferred tax asset, net	83
Other current liabilities	162
Operating lease liabilities - current	19,797
Other non-current liabilities	(16,297)
Operating lease liabilities - non-current portion	222,594
Retained earnings	(22)
Cinema [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Costs and expenses	48,329	$ 54,948
Cinema [Member] | Balance Without Adoption Of ASC 842 [[Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Costs and expenses	48,334
Cinema [Member] | Effect Of Change Higher/(Lower) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Costs and expenses	$ (5)