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Goodwill (Details) $ in Thousands | 6 Months Ended
--- | ---
Jul. 04, 2015 USD ($) item | Jun. 28, 2014 USD ($)
Goodwill |  |
Number of reporting units | item | 1 |
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 |  | 1,829
Effect of foreign currency translation | (9) | 494
Balance at the end of the period, gross | 154,187 | 155,789
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 | $ 82,294 | $ 83,896

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