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Goodwill and other intangible assets - Estimated Future Amortization Expense Related to Finite-lived Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 6,880  
2020 6,880  
2021 6,880  
2022 6,880  
2023 6,880  
Thereafter 573  
Finite-lived intangibles, Net carrying amount $ 34,973 $ 42,082