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Goodwill and Intangible Assets - Future Amortization Expense for Intangible Assets (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remaining nine months of 2019 $ 13,984
2020 17,618
2021 16,268
2022 14,918
2023 13,768
Thereafter 62,337
Total $ 138,893