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Acquisition of Citizen Engagement Centers Business - Schedule of Asset Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Nov. 16, 2018 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 585,735 | $ 399,882
General Dynamics Information Technology's Citizen Engagement Centers |  |  |
Business Acquisition [Line Items] |  |  |
Estimated cash consideration | $ 429,335 |  |
Billed and unbilled receivables | 145,319 |  |
Property and equipment | 6,454 |  |
Other assets | 681 |  |
Intangible assets | 122,300 |  |
Total identifiable assets acquired | 274,754 |  |
Accounts payable and other liabilities | 33,296 |  |
Net identifiable assets acquired | 241,458 |  |
Goodwill | 187,877 |  |
Net assets acquired | $ 429,335 |  |

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