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Goodwill and other intangible assets - Future Annual Amortization Expense (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2020 $ 73,439
2021 67,351
2022 64,209
2023 57,793
2024 51,330
Thereafter 156,760
Amortizable intangible assets, net $ 470,882