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Acquisition of Citizen Engagement Centers Business - Schedule of Asset Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Nov. 16, 2018 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 587,751 |  |  | $ 399,882
General Dynamics Information Technology's Citizen Engagement Centers |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated cash consideration | 430,573 | $ 429,335 |  |
Measurement period adjustments, consideration transferred | 1,238 |  |  |
Billed and unbilled receivables | 141,869 | 145,319 |  |
Measurement period adjustments, billed and unbilled receivables | (3,450) |  |  |
Property and equipment | 6,454 | 6,454 |  |
Measurement period adjustment, property, plant, and equipment | 0 |  |  |
Other assets | 4,093 | 681 |  |
Measurement period adjustment, other assets | 3,412 |  |  |
Intangible assets | 122,300 | 122,300 | $ 122,300 |
Measurement period adjustment, intangible assets | 0 |  |  |
Total identifiable assets acquired | 274,716 | 274,754 |  |
Measurement period adjustment, total identifiable assets acquired | (38) |  |  |
Accounts payable and other liabilities | 32,205 | 33,296 |  |
Measurement period adjustment, accounts payable and other liabilities | (1,091) |  |  |
Net identifiable assets acquired | 242,511 | 241,458 |  |
Measurement period adjustment, net identifiable assets acquired | 1,053 |  |  |
Goodwill | 188,062 | 187,877 | $ 188,100 |
Measurement period adjustments, goodwill | 185 |  |  |
Net assets acquired | 430,573 | $ 429,335 |  |
Measurement period adjustment, net assets aquired | $ 1,238 |  |  |

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