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Commitments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingent Liabilities [Abstract]  
Future minimum lease payments under operating leases
         

Year ended December 31,

 

2012

  $ 16,983  

2013

    11,929  

2014

    9,803  

2015

    7,219  

2016

    5,659  

Thereafter

    14,351  
   

 

 

 
      65,944  

Sublease income

    (927
   

 

 

 
    $ 65,017  
   

 

 

 
Summary of changes in product warranties reserve
                         
    Year Ended
December 31, 2011
    Year Ended
December 31, 2010
    Year Ended
December 31, 2009
 

Warranty reserve, beginning of year

  $ 69,787     $ 64,417     $ 68,084  

Provision

    37,040       44,633       35,688  

Payments

    (42,819     (39,263     (39,355
   

 

 

   

 

 

   

 

 

 

Warranty reserve, end of year

  $ 64,008     $ 69,787     $ 64,417