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Acquisitions (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |
Purchase price of acquisition, net of cash acquired | $ 7,240 | $ 0
Dallas Service Center, Inc. |  |
Business Acquisition [Line Items] |  |
Purchase price of acquisition, net of cash acquired | 8,000 |
Contingent consideration to be paid to seller | $ 800 |

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