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Intangible assets and goodwill - Future Amortization (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 5,794
2019 23,172
2020 23,172
2021 23,172
2022 and thereafter 49,302
Total $ 124,612