Debt (Schedule Of Debt) (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt payable, net to 2038		$ 1,742,036	$ 1,996,007
Debt service guaranty liability		64,145	64,145
Obligations under capital leases		21,000	21,000
Total	[1]	$ 1,827,181	$ 2,081,152
Debt Payable Due Date Two Thousand Thirty Eight [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt stated interest rate		3.30%	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 June 30, 2018 and December 31, 2017 are Property, net of $203,421 and $207,969; Accrued Rent, Accrued Contract Receivables and Accounts Receivable, net of $10,184 and $12,011; Cash and Cash Equivalents of $7,636 and $9,025; Debt, net of $46,152 and $46,253.