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Repurchases of Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Equity [Abstract] |  |
Shares repurchased in the open market (in shares) | 277 | 721
Shares acquired through employee surrender for statutory tax withholding (in shares) | 28 | 30
Total shares repurchased (in shares) | 305 | 751
Cost of shares repurchased in the open market | $ 139,213 | $ 179,623
Cost of shares for employee surrenders | 14,983 | 8,604
Total cost of shares | $ 154,196 | $ 188,227
Average cost per share - open market repurchases (in dollars per share) | $ 501.62 | $ 249.20
Average cost per share - employee surrenders (in dollars per share) | 544.08 | 288.78
Average cost per share - total (in dollars per share) | $ 505.45 | $ 250.77

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