Debt (Minetta And Orpheum Theatres Loan) (Narrative) (Details) - USD ($) $ in Thousands		6 Months Ended		12 Months Ended
	Oct. 12, 2018	Jun. 30, 2019		Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Loan amount		$ 288,594		$ 252,929
Minetta And Orpheum Theatres Loan [Member]
Debt Instrument [Line Items]
Loan amount		$ 8,000	[1]	$ 8,000	$ 7,500
Minetta And Orpheum Theatres Loan [Member] | Santander Bank [Member]
Debt Instrument [Line Items]
Loan amount	$ 8,000
Debt instrument term		5 years

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