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Fair Value Measurements (Estimated Fair Value Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value Measurements [Abstract]    
Long-term debt, including current maturities, Carrying Amount $ 243,567 $ 221,913
Long-term debt, including current maturities, Fair Value $ 252,557 $ 230,393