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Goodwill and Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 5,381  
2018 4,905  
2019 2,642  
2020 2,003  
2021 and thereafter 277  
Net Carrying Amount $ 15,208 $ 17,192