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Other Assets And Deferred Charges, Net (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred Costs And Other Assets [Line Items]      
Amortization expense of deferred charges $ 5.2 $ 5.1 $ 5.4
Unsecured Revolving Credit Facility [Member]      
Deferred Costs And Other Assets [Line Items]      
Accumulated amortization of deferred lease origination costs 29.8    
Accumulated amortization of deferred financing costs $ 0.8