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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Changes in the carrying amount of goodwill      
Balance at the beginning of the period, gross $ 153,387 $ 154,196  
Effect of foreign currency translation (2,206) (809)  
Balance at the end of the period, gross 151,181 153,387 $ 154,196
Balance at the beginning of the period, Accumulated impairment losses (76,417) (71,893)  
Goodwill adjustments related to GNU   (4,524)  
Balance at the end of the period, Accumulated impairment losses (76,417) (76,417) (71,893)
Balance at the beginning of the period, net 76,970 82,303  
Balance at the end of the period, net 74,764 76,970 82,303
Intangible assets impairment losses $ 0 $ 0 $ 0