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Goodwill and Other Intangible Assets - Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Capitalized software $ 4,277 $ 1,227 $ 8,444 $ 2,567
Other definite-lived intangibles $ 1,642 $ 1,748 $ 3,330 $ 3,521