Debt (Schedule Of Debt) (Details) (USD $) In Thousands	Jun. 30, 2011		Dec. 31, 2010
Debt service guaranty liability	$ 74,075		$ 97,000
Unsecured notes payable under revolving credit facilities	177,850		80,000
Obligations under capital leases	45,383		21,000
Total	2,615,976	[1]	2,589,448	[1]
Debt Payable To 2038 [Member]
Debt payable	2,316,914		2,389,532
Industrial Revenue Bonds Payable To 2015 [Member]
Industrial revenue bonds payable to 2015 at 2.4%	$ 1,754		$ 1,916

[1] Consolidated Variable Interest Entities' Assets and Liabilities included in the above balances (See Note 3):