Debt (Summary Of Notes Payable) (Details) - USD ($) $ in Thousands										1 Months Ended	2 Months Ended	9 Months Ended		12 Months Ended
		Sep. 18, 2019	Aug. 08, 2019	Mar. 05, 2019	Feb. 05, 2018	Dec. 29, 2016	Dec. 13, 2016	Aug. 31, 2016	Mar. 03, 2016	Oct. 31, 2016	Apr. 30, 2018	Sep. 30, 2019		Dec. 31, 2018		Dec. 31, 2017
Debt Instrument [Line Items]
Contractual Facility												$ 279,215		$ 252,929
Balance Gross												195,066		167,043
Balance Net												192,310	[1]	162,740	[2]
Deferred financing costs, net												$ 2,800		$ 4,300
Trust Preferred Securities [Member]
Debt Instrument [Line Items]
Maturity date												Apr. 30, 2027		Apr. 30, 2027	[3]
Contractual Facility												$ 27,913		$ 27,913	[3]
Balance Gross												27,913		27,913	[3]
Balance Net												$ 26,228	[1]	$ 26,061	[2],[3]
Stated Interest Rate												6.27%		6.52%	[3]
Effective interest rate												6.27%	[4]	6.52%	[3]
Bank Of America Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date			Sep. 01, 2020	May 01, 2020								Oct. 01, 2020		May 01, 2020	[3]
Contractual Facility									$ 55,000			$ 55,000		$ 55,000	[3]
Balance Gross												27,000		25,000	[3]
Balance Net												$ 26,959	[1]	$ 25,000	[2],[3]
Stated Interest Rate												4.79%		5.02%	[3]
Effective interest rate												4.79%	[4]	5.02%	[3]
US Bank Of America Line Of Credit [Member]
Debt Instrument [Line Items]
Maturity date			Sep. 01, 2020							Oct. 31, 2019		Oct. 01, 2020		Oct. 31, 2019
Contractual Facility										$ 5,000		$ 5,000		$ 5,000
Balance Gross												5,000
Balance Net	[1]											$ 5,000
Stated Interest Rate												5.04%		5.48%
Effective interest rate												5.04%	[4]	5.48%	[3]
US Banc Of America Digital Projector Loan [Member]
Debt Instrument [Line Items]
Maturity date												Dec. 28, 2019		Dec. 28, 2019
Contractual Facility					$ 4,600						$ 4,900	$ 706		$ 2,604
Balance Gross												706		2,604
Balance Net												$ 706	[1]	$ 2,604	[2]
Stated Interest Rate												5.00%		5.00%
Effective interest rate												5.00%	[4]	5.00%	[3]
Cinemas 1, 2, 3 Term Loan [Member]
Debt Instrument [Line Items]
Maturity date												Dec. 01, 2019		Sep. 01, 2019
Contractual Facility								$ 15,000				$ 18,767		$ 19,086
Balance Gross												18,767		19,086
Balance Net												$ 18,597	[1]	$ 18,838	[2]
Stated Interest Rate												3.25%		3.25%
Effective interest rate												3.25%	[4]	3.25%	[3]
Minetta And Orpheum Theatres Loan [Member]
Debt Instrument [Line Items]
Maturity date												Nov. 01, 2023	[4]	Nov. 01, 2023
Contractual Facility												$ 8,000	[4]	$ 8,000		$ 7,500
Balance Gross												8,000	[4]	8,000
Balance Net												$ 7,880	[1],[4]	$ 7,857	[2]
Stated Interest Rate												4.15%	[4]	4.88%
Effective interest rate												5.15%	[4]	4.88%	[3]
U.S. Corporate Office Term Loan [Member]
Debt Instrument [Line Items]
Maturity date												Jan. 01, 2027		Jan. 01, 2027
Contractual Facility							$ 8,400					$ 9,320		$ 9,495
Balance Gross												9,320		9,495
Balance Net												$ 9,210	[1]	$ 9,373	[2]
Effective interest rate												4.61%	[4]	4.61%	[3]
Purchase Money Promissory Note [Member]
Debt Instrument [Line Items]
Maturity date		Sep. 18, 2024										Sep. 18, 2024
Contractual Facility												$ 3,519
Balance Gross												3,519
Balance Net	[1]											$ 3,519
Stated Interest Rate												5.00%
Effective interest rate	[4]											5.00%
Union Square Construction Financing [Member]
Debt Instrument [Line Items]
Maturity date												Dec. 29, 2019		Dec. 29, 2019	[5]
Contractual Facility						$ 57,500						$ 50,000		$ 57,500	[5]
Balance Gross												32,350		27,182	[5]
Balance Net												$ 31,915	[1]	$ 25,280	[2],[5]
Stated Interest Rate												6.27%
Effective interest rate												6.27%	[4]	8.35%	[3],[5]
NAB Corporate Loan Facility [Member]
Debt Instrument [Line Items]
Maturity date												Dec. 31, 2023	[6]	Dec. 31, 2023	[5]
Contractual Facility												$ 80,952	[6]	$ 46,856	[5]
Balance Gross												54,977	[6]	37,696	[5]
Balance Net												$ 54,782	[1],[6]	$ 37,660	[2],[5]
Stated Interest Rate												1.91%	[6]	3.05%	[5]
Effective interest rate												1.91%	[4],[6]	3.05%	[3],[5]
Westpac Bank Corporate Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date												Dec. 31, 2023	[6]	Dec. 31, 2023	[5]
Contractual Facility												$ 20,038	[6]	$ 21,475	[5]
Balance Gross												7,514	[6]	10,067	[5]
Balance Net												$ 7,514	[1],[6]	$ 10,067	[2],[5]
Stated Interest Rate												3.05%	[6]	3.80%	[5]
Effective interest rate												3.05%	[4],[6]	3.80%	[3],[5]
Minimum [Member] | U.S. Corporate Office Term Loan [Member]
Debt Instrument [Line Items]
Stated Interest Rate												4.44%		4.44%
Minimum [Member] | Union Square Construction Financing [Member]
Debt Instrument [Line Items]
Stated Interest Rate												6.27%		6.76%
Maximum [Member] | U.S. Corporate Office Term Loan [Member]
Debt Instrument [Line Items]
Stated Interest Rate												4.64%		4.64%
Maximum [Member] | Union Square Construction Financing [Member]
Debt Instrument [Line Items]
Stated Interest Rate														12.51%

[1] Net of deferred financing costs amounting to $2.8 million.

[2] Net of deferred financing costs amounting to $4.3 million.

[3] The interest rate derivatives associated with the Trust Preferred Securities and the Bank of America Credit Facility expired in October 2017 so the effective interest rate no longer applied as of December 31, 2018.

[4] The interest rate derivative associated with the Minetta & Orpheum loan provides for an effective fixed rate of 5.15%.

[5] The contractual facilities and outstanding balances of the foreign currency denominated borrowings were translated into U.S. dollars based on the applicable exchange rates as of December 31, 2018.

[6] The contractual facilities and outstanding balances of the foreign currency denominated borrowings were translated into U.S. dollars based on the applicable exchange rates as of September 30, 2019.