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Goodwill and Other Intangible Assets - Estimated Amortization Expense for Intangibles Subject to Amortization (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2018 $ 4,364
2019 4,165
2020 4,165
2021 4,165
2022 4,165
Thereafter $ 9,859