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Mortgage Loans Payable and Credit Facility (Effect of Derivative Financial Instruments On Consolidated Statements of Operations and Consolidated Statements of Equity) (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Designation/Cash Flow [Member] | Interest Rate Swap [Member]    
Derivative Instruments Gain Loss [Line Items]    
Net amount of Gain (loss) recognized in other comprehensive (loss) income (effective portion) $ 5,752,000 $ 474,000
Continuing Operations [Member]    
Derivative Instruments Gain Loss [Line Items]    
Net amount of (Loss) recognized in other comprehensive (loss)income reclassified into earnings (effective portion) $ (138,000) $ (866,000)