Debt (Schedule Of Debt) (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended						6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	May 31, 2012	Aug. 29, 2011	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2012 Debt Payable To 2038 [Member]	Dec. 31, 2011 Debt Payable To 2038 [Member]	Jun. 30, 2012 Industrial Revenue Bonds Payable To 2015 [Member]	Dec. 31, 2011 Industrial Revenue Bonds Payable To 2015 [Member]	Jun. 30, 2012 Maximum [Member] Debt Payable To 2038 [Member]	Dec. 31, 2011 Maximum [Member] Debt Payable To 2038 [Member]	Jun. 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%							$ 1,869,191	$ 2,268,668
Debt service guaranty liability			74,075		74,075
Unsecured notes payable under revolving credit facilities			229,000		166,500
Obligations under capital leases			21,000		21,000
Industrial revenue bonds payable to 2015 at 2.4%									1,419	1,594
Total			$ 2,194,685	[1]	$ 2,531,837	[1]
Debt maturity date	May 2012	May 31, 2012					2038	2038	2015	2015
Debt instrument stated interest percentage	5.30%								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):