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Goodwill and other intangible assets - Future Annual Amortization Expense (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 30,803
2020 27,106
2021 21,129
2022 18,005
2023 11,455
Thereafter 33,393
Amortizable intangible assets, net $ 141,891