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Product Warranty (Tables)
3 Months Ended
Jun. 30, 2012
Product Warranty [Abstract]  
Schedule Of Product Warranty Activity
    Three months ended  
    June 30,  
    2012     2011  
Balance at beginning of period $ 5,896   $ 7,907  
Accruals for warranties during the period   (167 )   (405 )
Settlements during the period   (229 )   (168 )
Balance at end of period $ 5,500   $ 7,334