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Goodwill (Details) (USD $)
 3 Months Ended
Apr. 04, 2015
item
Mar. 29, 2014
Goodwill    
Number of reporting units 1us-gaap_NumberOfReportableSegments  
Goodwill impairment $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss
Changes in the carrying amount of goodwill    
Balance at the beginning of the period, gross 154,196,000us-gaap_GoodwillGross 153,466,000us-gaap_GoodwillGross
Goodwill adjustments related to acquisitions   1,886,000us-gaap_GoodwillAcquiredDuringPeriod
Effect of foreign currency translation (696,000)us-gaap_GoodwillTranslationAdjustments 137,000us-gaap_GoodwillTranslationAdjustments
Balance at the end of the period, gross 153,500,000us-gaap_GoodwillGross 155,489,000us-gaap_GoodwillGross
Balance at the beginning of the period, Accumulated impairment losses (71,893,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (71,893,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill impairment 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss
Balance at the end of the period, Accumulated impairment losses (71,893,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (71,893,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Balance at the beginning of the period, net 82,303,000us-gaap_Goodwill 81,573,000us-gaap_Goodwill
Balance at the end of the period, net $ 81,607,000us-gaap_Goodwill $ 83,596,000us-gaap_Goodwill