Impact of COVID-19 Pandemic And Liquidity (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Impact Of Covid [Line Items]
Impairment of property			$ 0
Goodwill impairment			0
Working capital	$ 54,900,000		54,900,000
Revenue	$ 3,422,000	$ 76,009,000	$ 52,650,000	$ 137,501,000
Melbourne, Victoria [Member]
Impact Of Covid [Line Items]
Number of cinemas closed | item	7
COVID-19 [Member]
Impact Of Covid [Line Items]
Revenue	$ 0