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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jul. 01, 2017
Changes in the carrying amount of goodwill      
Balance at the beginning of the period, Goodwill gross   $ 165,417  
Effects of foreign currency translation   (344)  
Balance at the end of the period, Goodwill gross $ 165,073 165,073  
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 88,656 $ 88,656  
Intangible assets impairment losses $ 0   $ 510