Derivative and Hedging Activities (Location and Fair Value of Derivative Instruments as Reported in the Consoiidated Balance Sheet) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Location and fair value of derivative instruments as reported in the Consolidated Balance Sheet [Abstract]
Derivative Asset, Fair Value, Gross Asset	$ 258	$ 0
Derivative Liability, Fair Value, Gross Liability	(31,895)	(15,922)
Default Option, Range, Minimum [Member]
Location and fair value of derivative instruments as reported in the Consolidated Balance Sheet [Abstract]
Interest Rate Recourse Provisions	100
Default Option, Range, Maximum [Member]
Location and fair value of derivative instruments as reported in the Consolidated Balance Sheet [Abstract]
Interest Rate Recourse Provisions	50,000
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	(30,043)	(15,419)
Unconsolidated Properties [Member] | 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	(1,852)	(412)
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 Asset, Fair Value, Gross Asset	258
Derivative Liability, Fair Value, Gross Liability		$ (91)