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Intangible assets and goodwill - Future Amortization (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 13,273
2020 26,566
2021 26,566
2022 26,566
2023 and thereafter 33,258
Total $ 126,229