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Intangible Assets and Goodwill - Amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 10,406  
2019 10,112  
2020 10,106  
2021 10,066  
2022 10,066  
Due thereafter 45,957  
Net intangible assets $ 96,713 $ 107,118