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Taxes (Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
U.S $ (102,810) $ (517,227) $ (72,249)
Non-U.S 122,980 63,473 186,557
Income (loss) before income taxes $ 20,170 $ (453,754) $ 114,308