Debt (Schedule Of Debt) (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt payable, net to 2038		$ 2,001,194	$ 2,023,403
Unsecured notes payable under credit facilities		125,000	245,000
Debt service guaranty liability		67,125	67,125
Obligations under capital leases		21,000	21,000
Total	[1]	$ 2,214,319	$ 2,356,528
Debt Payable Due Date Two Thousand Thirty Eight [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt stated interest rate		2.60%	1.70%
Debt Payable Due Date Two Thousand Thirty Eight [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt stated interest rate		7.90%	7.90%
Debt Payable Due Date Two Thousand Thirty Eight [Member] | Weighted Average [Member]
Debt Instrument [Line Items]
Debt stated interest rate		4.00%	4.00%

[1] Consolidated variable interest entities' assets and debt included in the above balances (see Note 15) at September 30, 2017 and December 31, 2016 are Property, net of $210,184 and $476,117; Accrued Rent and Accounts Receivable, net of $11,385 and $11,066; Cash and Cash Equivalents of $8,457 and $9,560; Debt, net of $46,473 and $47,112.