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Product Warranty
9 Months Ended
Dec. 31, 2010
Product Warranty  
Product Warranty

9.        Product Warranty

The Company generally provides a one to two year warranty on its products, commencing upon installation. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience.

Product warranty activity was as follows (in thousands):

                       
    Three months ended
December 31,
    Nine months ended
December 31,
 
    2010     2009     2010     2009  
Balance at beginning of period $ 7,374   $ 5,497   $ 6,431   $ 4,749  
Accruals for warranties during the period   2,193     2,238     6,533     4,955  
Settlements and adjustments during the period   (1,119 )   (1,703 )   (4,516 )   (3,672 )
Balance at end of period $ 8,448   $ 6,032   $ 8,448   $ 6,032