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Goodwill and other intangible assets - Future Annual Amortization Expense (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 21,412
2019 20,029
2020 16,332
2021 10,457
2022 7,543
Thereafter 5,546
Finite-Lived Intangible Assets, Net $ 81,319