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Goodwill and Intangible Assets - Estimated amortization expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Estimated amortization expense    
2018 (remainder for the year) $ 16,033  
2019 46,772  
2020 42,017  
2021 37,345  
2022 32,390  
2023 and thereafter 138,066  
Total $ 312,623 $ 294,997