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Goodwill and Other Intangible Assets - Estimated Amortization Expense For Intangibles Subject To Amortization (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
April 1 to December 31, 2018 $ 3,246
2019 4,165
2020 4,165
2021 4,165
2022 4,165
2023 3,169
Thereafter $ 6,690