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Intangible assets and goodwill - Future Amortization (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 18,207
2020 24,277
2021 24,277
2022 24,276
2023 and thereafter 27,418
Total $ 118,455