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Derivative and Hedging Activities (Location and Fair Value of Derivative Instruments as Reported in the Consoiidated Balance Sheet) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Derivatives, Fair Value [Line Items]      
Derivative Asset, Fair Value, Gross Asset $ 8,157   $ 1,699
Location and fair value of derivative instruments as reported in the Consolidated Balance Sheet [Abstract]      
Derivative Liability, Fair Value, Gross Liability (1,755)   (2,471)
Default Option, Range, Minimum [Member]      
Derivatives, Fair Value [Line Items]      
Interest Rate Recourse Provisions 100    
Default Option, Range, Maximum [Member]      
Derivatives, Fair Value [Line Items]      
Interest Rate Recourse Provisions 50,000    
Consolidated Properties [Member] | Interest Rate Contract [Member] | Deferred Charges And Other Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Fair Value, Gross Asset 6,327   939
Consolidated Properties [Member] | Interest Rate Contract [Member] | Accounts Payable and Accrued Liabilities [Member]      
Location and fair value of derivative instruments as reported in the Consolidated Balance Sheet [Abstract]      
Derivative Liability, Fair Value, Gross Liability   (484)
Unconsolidated Properties [Member] | Interest Rate Contract [Member] | Equity Method Investments [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Fair Value, Gross Asset 1,830   760
Location and fair value of derivative instruments as reported in the Consolidated Balance Sheet [Abstract]      
Derivative Liability, Fair Value, Gross Liability (55)   (357)
Unconsolidated Properties [Member] | Cross Currency Interest Rate Contract [Member] | Equity Method Investments [Member]      
Location and fair value of derivative instruments as reported in the Consolidated Balance Sheet [Abstract]      
Derivative Liability, Fair Value, Gross Liability (1,700)   $ (1,630)
Cash Flow Hedging [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (774) $ (3,235)  
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net $ 7,193 $ 1,842