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Long-Term Debt (Corporation's Long Term Debt Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Long-Term Debt [Abstract]    
2012 $ 7,182  
2013 6,181  
2014 5,229  
2015 370,207  
2016 109  
Thereafter 671,176  
Total debt $ 1,060,084 $ 1,030,759