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Pension and Retirement Plans
6 Months Ended
Jun. 30, 2011
Pension and Retirement Plans  
Pension and Retirement Plans
9.  Pension and Retirement Plans
All of the Company's plans that provide retirement and similar benefits are defined contribution plans.  These expenses include the impact of market gains and losses on assets held in deferred compensation plans.  Expenses for the Company's pension and profit-sharing plans, excess benefit plans and other similar plans for the three and six months ended June 30, 2011 and 2010 are as follows (in thousands):
 
Three months ended
   
Six months ended
 
June 30,
   
June 30,
 
2011
   
2010
   
2011
   
2010
 
$ 2,871     $ 2,200     $ 6,954     $ 4,746