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Summary Of Significant Accounting Policies (Schedule Of Estimated Useful Lives Of Assets) (Details)
12 Months Ended
Dec. 31, 2017
Building And Improvements [Member] | Minimum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Estimated useful life 15 years
Building And Improvements [Member] | Maximum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Estimated useful life 60 years
Theater Equipment [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Estimated useful life 7 years
Furniture And Fixtures [Member] | Minimum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Estimated useful life 5 years
Furniture And Fixtures [Member] | Maximum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Estimated useful life 10 years