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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Estimated amortization expense    
2017 (Remainder of year) $ 1,895  
2018 3,755  
2019 3,649  
2020 3,309  
2021 3,169  
Thereafter 7,623  
Estimated amortization expense $ 23,400 $ 25,297