Debt (Schedule Of Debt) (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended					9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Aug. 29, 2011	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2012 Debt Payable To 2038 [Member]	Dec. 31, 2011 Debt Payable To 2038 [Member]	Sep. 30, 2012 Industrial Revenue Bonds Payable To 2015 [Member]	Dec. 31, 2011 Industrial Revenue Bonds Payable To 2015 [Member]	Sep. 30, 2012 Maximum [Member] Debt Payable To 2038 [Member]	Dec. 31, 2011 Maximum [Member] Debt Payable To 2038 [Member]	Sep. 30, 2012 Minimum [Member] Debt Payable To 2038 [Member]	Dec. 31, 2011 Minimum [Member] Debt Payable To 2038 [Member]
Debt Instrument [Line Items]
Debt payable to 2038 at 2.6% to 8.8% in 2012 and 1.5% to 8.8% in 2011						$ 1,881,013	$ 2,268,668
Unsecured notes payable under revolving credit facilities		250,000		166,500
Debt service guaranty liability		74,075		74,075
Obligations under capital leases		21,000		21,000
Industrial revenue bonds payable to 2015 at 2.4%								1,331	1,594
Total		$ 2,227,419	[1]	$ 2,531,837	[1]
Debt maturity date	May 31, 2012					Dec. 31, 2038	Dec. 31, 2038	Nov. 04, 2015	Nov. 04, 2015
Debt instrument stated interest percentage								2.40%	2.40%	8.80%	8.80%	2.60%	1.50%

[1] * Consolidated Variable Interest Entities’ Assets and Liabilities included in the above balances (See Note 17):