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Acquisition and Divestiture Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 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 |  | $ 0 | $ 0 | $ 6,750
Acquisition of noncontrolling interests |  | (4,100) | 0 | 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |
Goodwill |  | $ 142,742 | 141,407 | 138,244
UltraSource [Member] |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Acquisition of business, net of cash acquired | $ 13,372 |  |  |
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 |

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