Debt (Schedule Of Debt) (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt payable, net to 2038		$ 1,705,776	$ 1,706,886
Unsecured notes payable under credit facilities		0	5,000
Debt service guaranty liability		60,900	60,900
Finance lease obligation		21,875
Finance lease obligation			21,898
Total	[1]	$ 1,788,551	$ 1,794,684
Debt Payable Due Date Two Thousand Thirty Eight [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt stated interest rate		3.30%	3.30%
Debt Payable Due Date Two Thousand Thirty Eight [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt stated interest rate		7.00%	7.00%
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 March 31, 2019 and December 31, 2018 are Property, net of $201,924 and $198,466; Accrued Rent, Accrued Contract Receivables and Accounts Receivable, net of $8,863 and $12,220; Cash and Cash Equivalents of $8,710 and $8,243; Debt, net of $45,582 and $45,774.