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Goodwill and Other Intangible Assets - Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Capitalized software $ 4,290 $ 2,658 $ 12,734 $ 5,225
Other definite-lived intangibles $ 1,642 $ 1,746 $ 4,972 $ 5,267