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Other Assets And Deferred Charges, Net (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Assets And Deferred Charges, Net [Abstract]      
Amortization expense of deferred charges $ 5.6us-gaap_AmortizationOfDeferredCharges $ 5.2us-gaap_AmortizationOfDeferredCharges $ 7.9us-gaap_AmortizationOfDeferredCharges
Accumulated amortization of deferred lease origination costs 22.4us-gaap_DeferredCostsLeasingAccumulatedAmortization    
Accumulated amortization of deferred financing costs $ 11.9us-gaap_AccumulatedAmortizationDeferredFinanceCosts