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Intangible assets and goodwill - Schedule of Goodwill (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Goodwill [Roll Forward]  
Goodwill beginning of the period $ 954,282
Business acquisitions 752,418
Divestiture of operating entity (26,513)
Goodwill end of the period $ 954,282