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Intangible assets and goodwill (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Intangible Assets And Goodwill [Abstract]      
Intangible assets other than goodwill $ 188,358 $ 189,350  
Goodwill 34,726 34,866 $ 37,972
Total $ 223,084 $ 224,216 $ 151,759