Credit Facilities, Short-term Borrowings and Long-term Debt (Details 1) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Long-term Debt
Long-term Debt	$ 2,821,438	$ 2,432,762	$ 2,757,770
Less current maturities of long-term debt	5,215	5,246	325,249	[1]
Long-term debt	2,816,223	2,427,516	2,432,521	[1]
Estimated fair value of total long-term debt	2,649,207	2,559,059	2,689,770
6.50% notes due 2016 [Member]
Long-term Debt
Long-term Debt	519,072	0	0
7.50% notes due 2021 [Member]
Long-term Debt
Long-term Debt	600,000	0	0
Floating-rate term loan due 2015 [Member]
Long-term Debt
Long-term Debt	0	450,000	450,000
10.125% notes due 2015 [Member]
Long-term Debt
Long-term Debt	153,640	149,597	149,582
10.375% notes due 2018 [Member]
Long-term Debt
Long-term Debt	248,491	248,391	248,360
7.00% notes due 2018 [Member]
Long-term Debt
Long-term Debt	399,684	399,658	399,649
Floating-rate notes due 2010 [Member]
Long-term Debt
Long-term Debt	0	0	325,000
5.60% notes due 2012 [Member]
Long-term Debt
Long-term Debt	134,496	299,773	299,746
6.40% notes due 2017 [Member]
Long-term Debt
Long-term Debt	349,865	349,852	349,848
7.15% notes due 2037 [Member]
Long-term Debt
Long-term Debt	239,544	249,324	249,322
Medium-term notes [Member]
Long-term Debt
Long-term Debt	21,000	21,000	21,000
Industrial revenue bonds [Member]
Long-term Debt
Long-term Debt	14,000	14,000	14,000
Other notes [Member]
Long-term Debt
Long-term Debt	1,309	1,438	1,559
6.30% notes due 2013 [Member]
Long-term Debt
Long-term Debt	$ 140,337	$ 249,729	$ 249,704

[1] As Restated, See Note 1