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Goodwill and Intangible Assets Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets    
2017 $ 10,996  
2018 43,659  
2019 41,381  
2020 26,718  
2021 20,086  
Thereafter 47,914  
Intangible assets, net $ 190,754 $ 217,548