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Acquisitions (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 212,171 | $ 214,489
Software Company |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price of acquired assets | $ 25,000 |  |
Holdback payment | 1,000 |  |
Contingent payment | $ 1,500 |  |
Contingent payment period | 36 months |  |
Goodwill | $ 20,300 |  |
Net tangible liabilities | 300 |  |
Technology-Based Intangible Assets | Software Company |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 2,600 |  |
Customer Relationships | Software Company |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | $ 2,400 |  |

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