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Additional Financial Information Disclosure
6 Months Ended
Jun. 30, 2011
Basis of Presentation/Additional Financial Information Disclosure [Abstract]  
Additional Financial Information Disclosure
Note 2 Additional Financial Information Disclosure
     The consolidated condensed balance sheet at December 31, 2010 was derived from amounts included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2010. Refer to the footnotes to the financial statements included in that report for a description of the Company’s accounting policies and for additional details of the Company’s financial condition. The details in those notes have not changed except as discussed below and as a result of normal adjustments in the interim.
     Warranty and After-Sale Costs
     The Company estimates and records provisions for warranties and other after-sale costs in the period in which the sale is recorded, based on a lag factor and historical warranty claim experience. After-sale costs represent a variety of activities outside of the written warranty policy, such as investigation of unanticipated problems after the customer has installed the product, or problems caused by water quality issues. The following table presents changes in the Company’s warranty and after-sale costs reserve for the three- and six-month periods ended June 30, 2011 and 2010.
                                 
    Three months     Six months  
    ended     ended  
    June 30,     June 30,  
(In thousands)   2011     2010     2011     2010  
Balance at beginning of period
  $ 911     $ 969     $ 889     $ 907  
Net additions charged to earnings
    272       231       476       429  
Costs incurred and adjustments
    (251 )     (56 )     (433 )     (192 )
 
Balance at end of period
  $ 932     $ 1,144     $ 932     $ 1,144