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Product Warranties (Schedule Of Product Warranty Liability) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Oct. 02, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance as of beginning of the period $ 44,846 $ 40,513
Provision for warranty liability made during the period 44,451 42,961
Settlements made during the period (44,904) (42,898)
Balance at end of period $ 44,393 $ 40,576