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Intangible Assets and Goodwill - Estimated Future Amortization of Intangible Assets, Other Than Goodwill (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
Remainder of 2019 $ 18,969
2020 22,271
2021 21,462
2022 18,312
2023 $ 14,157