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Acquisition Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Jul. 01, 2017
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Acquisition of business, net of cash acquired |  |  | $ 14,880 | $ 0
UltraSource [Member] |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Purchase price of businesses |  | $ 13,596 |  |
Finite-lived Intangible Assets Acquired |  | 6,500 |  |
Goodwill related to acquisitions |  | $ 4,227 |  |
Business Acquisition, Name of Acquired Entity |  | UltraSource, Inc. |  |
Business Acquisition, Effective Date of Acquisition |  | Feb. 08, 2018 |  |
EuroPower [Member] |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Purchase price of businesses | $ 2,949 |  |  |
Goodwill related to acquisitions | $ 1,078 |  |  |
Business Acquisition, Name of Acquired Entity | EuroPower Holdings Ltd. |  |  |
Business Acquisition, Effective Date of Acquisition | Jun. 11, 2018 |  |  |

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