Debt (Schedule Of Debt) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Schedule of Long-term Debt, By Type [Line Items]
Debt payable, net to 2038		$ 1,996,007	$ 2,023,403
Unsecured notes payable under credit facilities		0	245,000
Debt service guaranty liability		64,145	67,125
Obligations under capital leases		21,000	21,000
Total	[1]	$ 2,081,152	$ 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 December 31, 2017 and December 31, 2016 are Property, net of $207,969 and $476,117; Accrued Rent and Accounts Receivable, net of $12,011 and $11,066; Cash and Cash Equivalents of $9,025 and $9,560; Debt, net of $46,253 and $47,112.