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Acquisitions (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 04, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |
Goodwill | $ 353,340 | $ 354,838
Weighted-average useful life of acquired intangible assets | 8 years | 8 years
Pro forma effect of business acquisitions | The i mpact of the acquisition of Electroforce on the Company's revenues and net income since the acquisition date for the six months ended July 4, 2015 was immaterial. |
Acquisitions in 2015 [Member] |  |
Business Acquisition [Line Items] |  |
Accounts receivable and other current assets acquired | $ 1,520 |
Inventory acquired | 4,489 |
Property, plant and equipment acquired | 699 |
Intangible assets acquired | 3,700 |
Goodwill | 1,118 |
Total assets acquired | 11,526 |
Accrued expenses and other current liabilities acquired | 2,118 |
Cash consideration paid | $ 9,408 |
Acquisitions in 2015 [Member] | Unpatented Technology [Member] |  |
Business Acquisition [Line Items] |  |
Weighted-average useful life of acquired intangible assets | 10 years |
Acquisitions in 2015 [Member] | Customer Relationships [Member] |  |
Business Acquisition [Line Items] |  |
Weighted-average useful life of acquired intangible assets | 5 years |

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