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Long-Term Debt (Long-Term Debt Maturities) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Long-Term Debt Disclosure [Abstract]  
2012 $ 0
2013 0
2014 332,000,000
2015 0
2016 250,000,000
Thereafter 1,100,000,000
Total 1,682,000,000 [1]
Unamortized premium $ 5,100,000
[1] Excludes an unamortized premium of $5.1 million as of December 31, 2011.