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Goodwill (Details)
$ in Thousands
 9 Months Ended
Oct. 03, 2015
USD ($)
item
Sep. 27, 2014
USD ($)
Goodwill    
Number of reporting units | item 2  
Goodwill impairment $ 0 $ 0
Changes in the carrying amount of goodwill    
Balance at the beginning of the period, gross 154,196 153,466
Goodwill adjustments related to acquisitions   1,797
Effect of foreign currency translation (389) (1,067)
Balance at the end of the period, gross 153,807 154,196
Balance at the beginning of the period, Accumulated impairment losses (71,893) (71,893)
Balance at the end of the period, Accumulated impairment losses (71,893) (71,893)
Balance at the beginning of the period, net 82,303 81,573
Balance at the end of the period, net $ 81,914 $ 82,303