Property And Equipment (Narrative) (Details) $ in Millions			3 Months Ended		9 Months Ended
	Aug. 28, 2019 USD ($)	Jun. 13, 2018 AUD ($) m²	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 29, 2018 m²	Jun. 29, 2018 ft²	Jun. 29, 2018 AUD ($)	Jun. 29, 2018 m	Jun. 29, 2018 ft	Jun. 29, 2018 USD ($)	Jun. 13, 2018 ft²
Property, Plant and Equipment [Line Items]
Depreciation expense for operating property			$ 5.5	$ 5.4	$ 16.3	$ 15.6
Land At Cannon Park, Townsville, Australia [Member]
Property, Plant and Equipment [Line Items]
Area of property		15,150											163,000
Payment to acquire property		$ 1
Property In Auburn/Redyard, Australia [Member]
Property, Plant and Equipment [Line Items]
Sale price									$ 4,500,000			$ 3.5
Village East Cinema, Manhattan [Member]
Property, Plant and Equipment [Line Items]
Payment to acquire property	$ 5.9
Building [Member] | Property In Auburn/Redyard, Australia [Member]
Property, Plant and Equipment [Line Items]
Area of property | ft²								16,830
Land [Member] | Property In Auburn/Redyard, Australia [Member]
Property, Plant and Equipment [Line Items]
Area of property | ft²								20,870
Redyard ETC [Member] | Land [Member] | Property In Auburn/Redyard, Australia [Member]
Property, Plant and Equipment [Line Items]
Area of property							48,309	519,992
Length of frontage										498	1,620