Debt (US Union Square Construction Financing) (Narrative) (Details) $ in Thousands		9 Months Ended		12 Months Ended
	Dec. 29, 2016 USD ($) loan	Sep. 30, 2017 USD ($)		Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Contractual facility		$ 272,717		$ 266,134
US Union Square Construction Financing [Member]
Debt Instrument [Line Items]
Contractual facility	$ 57,500	57,500	[1]	57,500	[2]
Advanced-to-Date		8,000
Facility Limit		57,500
US Union Square Construction Financing [Member] | Bank Of The Ozarks [Member]
Debt Instrument [Line Items]
Contractual facility	$ 50,000
Number of loan tranches | loan	3
Advanced-to-Date				8,000
Facility Limit				$ 8,000
US Union Square Construction Financing [Member] | Tammany Mezz Investor, LLC [Member] | Mezzanine Loan [Member]
Debt Instrument [Line Items]
Contractual facility	$ 7,500
Facility Limit		$ 7,500

[1] The loan for our Minetta & Orpheum Theatres was obtained from Santander Bank. The term loan for our Cinema 1,2,3 Theatre was refinanced during the third quarter of 2016 with Valley National Bank. The term loan, which is collateralized by our new U.S Corporate Headquarters office building, was obtained with Citizens Asset Finance, Inc. In December 2016, we completed the negotiation of the construction financing for our Union Square redevelopment project, $8.0 million of which was advanced from the total construction loan limit of $57.5 million.

[2] The loan for our Minetta & Orpheum Theatres was obtained from Santander Bank. The term loan for our Cinema 1,2,3 Theatre was refinanced during the third quarter of 2016 with Valley National Bank. The term loan, which is collateralized by our new U.S Corporate Headquarters office building, was obtained with Citizens Asset Finance, Inc.. In December 2016, we completed the negotiation of the construction financing for our Union Square redevelopment project, $8.0 million of which was advanced from the total construction loan limit of $57.5 million. The Minetta & Orpheum Theatres Loan will become due within one year. Currently, we are negotiating with our lender to renew this borrowing. Our loan arrangements are presented, net of the deferred financing costs, on the face of our consolidated balance sheet as follows:Dollars in thousandsBalance Sheet CaptionSeptember 30, 2017December 31, 2016Debt - current portion$ 8,084$ 567 Debt - long-term portion 111,939 115,707 Subordinated debt 27,501 27,340 Total borrowings $ 147,524$ 143,614