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Goodwill and other intangible assets - Estimated Future Amortization Expense Related to Finite-lived Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
2021 $ 8,123    
2022 8,123    
2023 8,122    
2024 6,963    
2025 1,230    
Thereafter 6,049    
Finite-lived intangibles, Net carrying amount $ 38,610 $ 33,253 $ 34,973