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Stockholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 30, 2018
Accumulated other comprehensive income (loss) [Line Items]    
Accumulated other comprehensive loss $ (157,346) $ (142,755)
Accumulated foreign currency translation adjustment [Member]    
Accumulated other comprehensive income (loss) [Line Items]    
Accumulated other comprehensive loss (137,886) (135,149)
Accumulated net loss from designated or qualifying cash flow hedges [Member]    
Accumulated other comprehensive income (loss) [Line Items]    
Accumulated other comprehensive loss $ (19,460) $ (7,606)