Share repurchases (Details) - USD ($) $ in Thousands	1 Months Ended
	May 04, 2020	Nov. 04, 2019
Equity, Class of Treasury Stock [Line Items]
Terminated Remaining Prior Share Repurchases Authorized, Amount		$ 246,373
Stock Repurchase Program, Authorized Amount		$ 2,000,000
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)	0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,400,356