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Goodwill and Other Intangible Assets - Estimated Amortization Expense for Intangibles Subject to Amortization (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 4,165
2020 4,165
2021 4,165
2022 4,165
2023 3,168
Thereafter $ 6,690