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Fair Value Of Financial Instruments (Fair Value Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value Of Financial Instruments [Abstract]    
Long-term debt, Recorded Amount $ 763,673 $ 860,910
Long-term debt, Fair Value $ 819,854 $ 879,511