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Goodwill and Intangible Assets - Estimated amortization expense (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Estimated amortization expense    
2018 (remainder for the year) $ 23,012  
2019 41,232  
2020 36,558  
2021 31,091  
2022 27,161  
2023 and thereafter 132,712  
Total $ 291,766 $ 294,997