Debt (Schedule Of Debt) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Schedule of Long-term Debt, By Type [Line Items]
Debt payable, net to 2038 (1)	$ 1,743,792	[1]	$ 1,656,083	[1]
Unsecured notes payable under credit facilities	104,000		189,000
Debt service guaranty liability	72,105		72,105
Obligations under capital leases	21,000		21,000
Total	$ 1,940,897	[2]	$ 1,938,188	[2]
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	2.60%		3.40%
Debt Payable To 2038 [Member] | Maximum [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate	8.60%		8.60%
Debt Payable To 2038 [Member] | Weighted Average [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate	4.50%		4.90%

[1] At March 31, 2015, interest rates ranged from 2.6% to 8.6% at a weighted average rate of 4.5%. At December 31, 2014, interest rates ranged from 3.4% to 8.6% at a weighted average rate of 4.9%.

[2] Consolidated variable interest entities' assets held as collateral and debt included in the above balances (see Note 15):