Debt (Schedule Of Debt) (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Schedule of Long-term Debt, By Type [Line Items]
Debt payable, net to 2038		$ 2,023,403	$ 1,872,942
Unsecured notes payable under credit facilities		245,000	149,500
Debt service guaranty liability		67,125	69,835
Obligations under capital leases		21,000	21,000
Total	[1]	$ 2,356,528	$ 2,113,277
Debt Payable To 2038 [Member] | Minimum [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate		1.73%	1.00%
Debt Payable To 2038 [Member] | Maximum [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate		7.89%	8.60%
Debt Payable To 2038 [Member] | Weighted Average [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate		4.00%	4.30%

[1] Consolidated variable interest entities' assets held as collateral and debt included in the above balances at December 31, 2016 and December 31, 2015 are Property, net of $476,117 and $240,689; Investment in Real Estate Joint Ventures and Partnerships, net of $0, and $18,278; Accrued Rent and Accounts Receivable, net of $11,066 and $9,245; Cash and Cash Equivalents of $9,560 and $13,250; Debt, net of $47,112 and $47,919.