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Repurchases of Common Stock (Details) - 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 [Abstract] |  |  |  |
Shares repurchased in the open market (in shares) | 341 | 0 | 618 | 721
Shares acquired through employee surrender for statutory tax withholding (in shares) | 0 | 0 | 28 | 30
Total shares repurchased (in shares) | 341 | 0 | 646 | 751
Cost of shares repurchased in the open market | $ 188,409 | $ 0 | $ 327,622 | $ 179,623
Cost of shares for employee surrenders | 3 | 65 | 14,986 | 8,669
Total cost of shares | $ 188,412 | $ 65 | $ 342,608 | $ 188,292
Average cost per share - open market repurchases (in USD per share) | $ 552.08 | $ 0 | $ 529.45 | $ 249.20
Average cost per share - employee surrenders (in USD per share) | 550.59 | 312.19 | 544.08 | 288.94
Average cost per share - total (in USD per share) | $ 552.08 | $ 312.19 | $ 530.07 | $ 250.79

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