Debt (Schedule Of Debt) (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Schedule of Long-term Debt, By Type [Line Items]
Debt payable, net to 2038		$ 1,872,942	$ 1,647,904
Unsecured notes payable under credit facilities		149,500	189,000
Debt service guaranty liability		69,835	72,105
Obligations under capital leases		21,000	21,000
Total	[1]	$ 2,113,277	$ 1,930,009
Debt stated interest rate		3.50%	7.40%
Debt Payable To 2038 [Member] | Minimum [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate		1.00%	3.40%
Debt Payable To 2038 [Member] | Maximum [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate		8.57%	8.60%
Debt Payable To 2038 [Member] | Weighted Average [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate		4.30%	4.80%

[1] Consolidated variable interest entities' assets held as collateral and debt included in the above balances (see Note 21):