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Taxes (Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Income Tax Disclosure [Abstract]      
U.S $ (142,141) $ (102,810) $ (517,227)
Non-U.S 110,810 122,980 63,473
Income (loss) before income taxes $ (31,331) $ 20,170 $ (453,754)