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Property And Equipment (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Aug. 28, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Property, Plant and Equipment [Line Items]          
Depreciation expense for operating property   $ 5.0 $ 5.4 $ 10.2 $ 10.8
Capitalized interest   $ 0.8   $ 1.7  
Village East Cinema, Manhattan [Member]          
Property, Plant and Equipment [Line Items]          
Payment to acquire property $ 5.9