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Acquisition Activities (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Apr. 01, 2017
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Acquisition of business, net of cash acquired | $ 12,072 | $ 0
UltraSource [Member] |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Purchase price of businesses | 13,372 |
Finite-lived Intangible Assets Acquired | 6,500 |
Goodwill related to acquisitions | $ 4,003 |
Business Acquisition, Name of Acquired Entity | UltraSource, Inc. |
Business Acquisition, Effective Date of Acquisition | Feb. 08, 2018 |

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