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Long-Term Debt (Schedule of Debt Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Debt Maturities [Abstract]  
2013 $ 381,729
2014 1,331,856
2015 270,959
2016 10,016,646
2017 74
Thereafter 9,154,754
Total $ 21,156,018