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Intangible Assets - Future Amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Expected intangible asset amortization expense    
Remaining 2018 $ 2,902  
2019 10,200  
2020 7,079  
2021 4,106  
2022 3,635  
Thereafter 12,041  
Total $ 39,963 $ 47,201