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Share repurchases Share Repurchase Table (Details) - Open Market Purchases - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Equity, Class of Treasury Stock [Line Items]        
Repurchase of common stock (in shares) 2,070 0 5,019 4,052
Treasury Stock, Value, Acquired, Cost Method $ 240,897 $ 0 $ 563,230 $ 303,139
Treasury Stock Acquired, Average Cost Per Share $ 116.38 $ 0 $ 112.21 $ 74.81