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Other Investment and Assets (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Other Investments and Assets [Abstract]    
Cash surrender value of life insurance $ 18,109 $ 18,812
Workers' compensation insurance security deposits 4,651 4,658
Other 7,369 7,581
Total other investment and assets $ 30,129 $ 31,051