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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 01, 2017
Changes in the carrying amount of goodwill    
Balance at the beginning of the period, Goodwill gross   $ 151,181
Goodwill adjustments related to acquisitions   12,250
Effect of foreign currency translation   726
Balance at the end of the period, Goodwill gross   164,157
Balance at the beginning of the period, Accumulated impairment losses   (76,417)
Balance at the end of the period, Accumulated impairment losses   (76,417)
Balance at the beginning of the period, Goodwill, net   74,764
Balance at the end of the period, Goodwill, net   87,740
Intangible assets impairment losses $ 0 $ 510