Debt (Schedule Of Debt) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Schedule of Long-term Debt, By Type [Line Items]
Unsecured notes payable under credit facilities	$ 0		$ 66,000
Debt service guaranty liability	73,740		74,075
Obligations under capital leases	21,000		21,000
Total	2,299,844	[1]	2,204,030	[1]
Debt Payable To 2038 [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt payable to 2038 at 2.6% to 8.6% in 2013 and 2.6% to 8.8% in 2012	2,205,104		2,041,709
Debt maturity date	Dec. 23, 2038		Dec. 23, 2038
Debt Payable To 2038 [Member] | Minimum [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate	2.60%		2.60%
Debt Payable To 2038 [Member] | Maximum [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate	8.60%		8.80%
Industrial Revenue Bonds Payable [Member]
Schedule of Long-term Debt, By Type [Line Items]
Industrial revenue bonds payable at 2.4% in 2012	$ 0		$ 1,246
Debt stated interest rate			2.40%

[1] * Consolidated variable interest entities' assets held as collateral and debt included in the above balances (see Note 22):