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Intangible Assets - Future Amortization (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Expected intangible asset amortization expense    
Remainder of 2018 $ 6,092  
2019 9,897  
2020 6,777  
2021 3,869  
2022 3,635  
Thereafter 12,042  
Finite-lived intangible assets, Net Book Value $ 42,312 $ 47,201