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Goodwill and Other Intangible Assets - Estimated Amortization Expense Related to Amortized Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Estimated amortization expense related to amortized intangible assets    
Remainder of 2018 $ 8,450  
2019 10,042  
2020 8,537  
2021 7,537  
2022 5,986  
Thereafter 19,783  
Amortized intangible assets, Net Carrying Value $ 60,335 $ 62,321