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Acquisition and Divestiture Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Apr. 02, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |  |  |
Acquisition of business, net of cash acquired |  |  |  | $ 14,880 | $ 0 | $ 0 |
Acquisition of noncontrolling interests |  |  |  | 0 | (4,100) | 0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |
Goodwill |  |  |  | 147,480 | $ 142,742 | $ 141,407 |
UltraSource [Member] |  |  |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |  |  |
Acquisition of business, net of cash acquired |  | $ 13,596 |  |  |  |  |
Finite-lived Intangible Assets Acquired |  | 6,500 |  |  |  |  |
Goodwill related to acquisitions |  | $ 4,227 |  | 4,227 |  |  |
Business Acquisition, Name of Acquired Entity |  | Ultrasource, Inc. |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  | Feb. 08, 2018 |  |  |  |  |
Sonntag [Member] |  |  |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |  |  |
Acquisition of business, net of cash acquired |  |  | $ 5,450 |  |  |  |
Goodwill related to acquisitions |  |  | $ 3,485 |  |  |  |
Gross purchase price of acquired business |  |  |  |  |  |  | $ 6,750
Business Acquisition, Name of Acquired Entity |  |  | Sonntag Electronic GmbH |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  | Jan. 01, 2016 |  |  |  |
EuroPower [Member] |  |  |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |  |  |
Acquisition of business, net of cash acquired | $ 2,939 |  |  |  |  |  |
Goodwill related to acquisitions | $ 1,068 |  |  | 1,068 |  |  |
Business Acquisition, Name of Acquired Entity | EuroPower Holdings Ltd. |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Jun. 11, 2018 |  |  |  |  |  |
Bi-Metallix [Member] |  |  |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |  |  |
Acquisition of business, net of cash acquired |  |  |  | $ 12,000 |  |  |
Business Acquisition, Name of Acquired Entity |  |  |  | Bi-Metallix, Inc. |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  | Jan. 03, 2019 |  |  |

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