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Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2011
Benefit Plans  
Schedule of contributions made to multi-employer plans

 

Benefit Plan
  2011   2010   2009  

Pension Plan

  $ 2,264   $ 1,835   $ 1,704  

Health Plan

    6,919     5,754     5,319  

Other plans

    5,111     4,143     3,638  
               

Total plan contributions

  $ 14,294   $ 11,732   $ 10,661