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Goodwill and other intangible assets - Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Goodwill [Roll Forward]        
Goodwill, Beginning Balance $ 541,850 $ 539,818 $ 541,480 [1] $ 539,818
Goodwill acquired 0 0 370 0
Goodwill, Ending Balance $ 541,850 $ 539,818 $ 541,850 $ 539,818
[1] Certain prior period amounts have been revised to correct immaterial errors. See Note 1 for more information.