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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 29, 2018
Sep. 30, 2017
Changes in the carrying amount of goodwill      
Balance at the beginning of the period, Goodwill gross   $ 165,417  
Effects of foreign currency translation   (438)  
Balance at the end of the period, Goodwill gross $ 164,979 164,979  
Balance at the beginning of the period, Accumulated impairment losses   (76,417)  
Balance at the end of the period, Accumulated impairment losses (76,417) (76,417)  
Balance at the beginning of the period, Goodwill, net   89,000  
Balance at the end of the period, Goodwill, net 88,562 $ 88,562  
Intangible assets impairment losses $ 0   $ 523