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Fair Value Of Financial Instruments (Fair Value Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Fair Value Of Financial Instruments [Abstract]    
Long-term debt, Recorded Amount $ 756,661 $ 763,673
Long-term debt, Fair Value $ 818,102 $ 819,854