Debt (Schedule Of Debt) (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt payable, net to 2038		$ 1,843,425	$ 1,996,007
Debt service guaranty liability		64,145	64,145
Obligations under capital leases		21,000	21,000
Total	[1]	$ 1,928,570	$ 2,081,152
Debt Payable Due Date Two Thousand Thirty Eight [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt stated interest rate		2.60%	2.60%
Debt Payable Due Date Two Thousand Thirty Eight [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt stated interest rate		7.00%	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 March 31, 2018 and December 31, 2017 are Property, net of $205,484 and $207,969; Accrued Rent and Accounts Receivable, net of $10,324 and $12,011; Cash and Cash Equivalents of $8,754 and $9,025; Debt, net of $46,030 and $46,253.