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Other Investment and Assets (Tables)
3 Months Ended
Mar. 31, 2013
Other Investments and Assets [Abstract]  
Summary of other investments and assets
                 
    March 31,
2013
    December 31,
2012
 
    (in thousands)  

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