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Acquisitions and Purchase Accounting Results of Operations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenue, Net $ 327,451 [1] $ 228,823 [1]
Operating Income (Loss) $ 42,195 $ 36,660
[1] Non-operating expenses are not allocated to the operating segments. Non-operating expenses consist of interest expense and deferred financing amortization, foreign exchange gains and losses and other income and expense items outside of income from operations.