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Share repurchases Share Repurchase Table (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Repurchase of common stock (in shares) | 2,731 | 8,232 | 7,750 | 12,284
Treasury Stock, Value, Acquired, Cost Method | $ 336,217 | $ 725,439 | $ 899,447 | $ 1,028,578
Treasury Stock Acquired, Average Cost Per Share | $ 123.14 | $ 88.13 | $ 116.06 | $ 83.73
Open Market Purchases |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Repurchase of common stock (in shares) | 2,731 | 250 | 7,750 | 4,302
Treasury Stock, Value, Acquired, Cost Method | $ 336,217 | $ 21,259 | $ 899,447 | $ 324,398
Treasury Stock Acquired, Average Cost Per Share | $ 123.14 | $ 85.04 | $ 116.06 | $ 75.40
Tender Offer Member |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Repurchase of common stock (in shares) | 0 | 7,982 | 0 | 7,982
Treasury Stock, Value, Acquired, Cost Method | $ 0 | $ 704,180 | $ 0 | $ 704,180
Treasury Stock Acquired, Average Cost Per Share | $ 0 | $ 88.22 | $ 0 | $ 88.22
Treasury Stock Acquired, Average Cost Per Share, Clearing Price |  | $ 88.00 |  | $ 88.00
Share Repurchase Fees And Expenses |  | $ 1,792 |  | $ 1,792

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