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Acquisition of Citizen Engagement Centers Business - Components of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 258,356 | $ 139,359
Accumulated Amortization | 53,803 | 51,324
Intangible Assets, net | 204,553 | 88,035
Customer contracts and relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 248,323 | 129,113
Accumulated Amortization | 45,273 | 42,683
Intangible Assets, net | 203,050 | 86,430
Technology based intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 5,564 | 5,750
Accumulated Amortization | 4,113 | 4,212
Intangible Assets, net | 1,451 | 1,538
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 4,469 | 4,496
Accumulated Amortization | 4,417 | 4,429
Intangible Assets, net | $ 52 | $ 67

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