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Warranty Accrual Activity (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 4,050 $ 3,177
Charged to cost of revenues 2,813 3,647
Actual warranty expenditures (3,057) (2,694)
Balance at end of period $ 3,806 $ 4,130