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Mortgage Loans Payable And Unsecured Credit Facilities (Effect Of The Derivative Financial Instruments On The Consolidated Statements Of Operations And Consolidated Statements Of Equity) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]      
Net amount of gain (loss) recognized in other comprehensive income (effective portion) $ (3,650,000)us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion $ 202,000us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion  
Net amount of gain (loss) recognized in other comprehensive income reclassified into earnings (effective portion) 32,301,000us-gaap_InterestExpense 34,762,000us-gaap_InterestExpense 38,289,000us-gaap_InterestExpense
Continuing Operations [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net amount of gain (loss) recognized in other comprehensive income reclassified into earnings (effective portion) 1,663,000us-gaap_InterestExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
749,000us-gaap_InterestExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
 
Discontinued Operations [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net amount of gain (loss) recognized in other comprehensive income reclassified into earnings (effective portion) $ 129,000us-gaap_InterestExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
$ 309,000us-gaap_InterestExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember