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Intangible Assets - Future Amortization (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Expected intangible asset amortization expense    
Remainder of 2018 $ 9,554  
2019 8,949  
2020 6,287  
2021 3,644  
2022 3,596  
Thereafter 12,043  
Finite-lived intangible assets, Net Book Value $ 44,073 $ 47,201