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Goodwill and other intangible assets Future amortization expense (Details 3)
$ in Thousands
Mar. 31, 2019
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2019 $ 1,403
2020 1,632
2021 1,242
2022 1,219
2023 1,237
Thereafter $ 4,947