Debt (Minetta And Orpheum Theatres Loan) (Narrative) (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
	Oct. 12, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Loan amount		$ 268,176	$ 271,732
Minetta And Orpheum Theatres Loan [Member]
Debt Instrument [Line Items]
Loan amount		$ 7,500	$ 7,500
Minetta And Orpheum Theatres Loan [Member] | Santander Bank [Member]
Debt Instrument [Line Items]
Debt instrument term		5 years
Minetta And Orpheum Theatres Loan [Member] | Subsequent Event [Member] | Santander Bank [Member]
Debt Instrument [Line Items]
Loan amount	$ 8,000