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Acquisitions Acquisition Detail (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 0 | $ 157 |  |
Goodwill | $ 20,794 | 20,794 | $ 18,804 | $ 20,079 | $ 19,614
revenue from acquired business | 700 | 1,500 |  |  |
Bolt [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to Acquire Businesses, Gross |  | 5,200 |  |  |
Trade Names [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 500 | $ 500 |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 15 years |  |  |
Customer Relationships [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 2,600 | $ 2,600 |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 10 years |  |  |

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