Debt (Schedule Of Debt) (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Schedule of Long-term Debt, By Type [Line Items]
Debt payable, net to 2038		$ 2,002,789	$ 2,023,403
Unsecured notes payable under credit facilities		200,600	245,000
Debt service guaranty liability		67,100	67,125
Obligations under capital leases		21,000	21,000
Total	[1]	$ 2,291,474	$ 2,356,528
Debt Payable To 2038 [Member] | Minimum [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate		2.60%	1.70%
Debt Payable To 2038 [Member] | Maximum [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate		7.90%	7.90%
Debt Payable To 2038 [Member] | Weighted Average [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate		4.00%	4.00%

[1] Consolidated variable interest entities' assets held as collateral and debt included in the above balances at March 31, 2017 and December 31, 2016 are Property, net of $216,223 and $476,117; Accrued Rent and Accounts Receivable, net of $9,723 and $11,066; Cash and Cash Equivalents of $7,797 and $9,560; Debt, net of $46,902 and $47,112.