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Acquisition of Citizen Engagement Centers Business - Estimated Future Amortization Expense For Intangible Assets (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Business Combinations [Abstract]  
Nine months ended September 30, 2019 $ 8,984
2020 35,279
2021 18,230
2022 15,857
2023 $ 15,760