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Other Investment and Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Summary of other investments and assets    
Cash surrender value of life insurance $ 19,183 $ 19,142
Workers' compensation insurance security deposits 3,350 3,350
Other 9,148 9,924
Total other investments and assets $ 31,681 $ 32,416