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Intangible Assets - Estimated Amortization of Intangible Assets (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2018, remaining nine months $ 8,629
2019 10,379
2020 8,962
2021 7,104
2022 4,408
2023 and beyond 3,817
Total estimated amortization expense $ 43,299