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Goodwill and Intangible Assets - Estimated Annual Amortization Expense (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Estimated annual amortization expense  
2019 $ 46,679
2020 46,491
2021 43,962
2022 43,326
2023 43,326
Thereafter 460,276
Net, finite lived intangible assets $ 684,060