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Repurchases of Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Equity [Abstract] |  |  |  |
Shares repurchased in the open market (in shares) | 0 | 330 | 721 | 683
Shares acquired through employee surrender for statutory tax withholding (in shares) | 1 | 1 | 31 | 38
Total shares repurchased (in shares) | 1 | 331 | 752 | 721
Cost of shares repurchased in the open market | $ 0 | $ 91,051 | $ 179,623 | $ 165,198
Cost of shares for employee surrenders | 360 | 277 | 9,029 | 7,849
Total cost of shares | $ 360 | $ 91,328 | $ 188,652 | $ 173,047
Average cost per share - open market repurchases (in dollars per share) | $ 0 | $ 275.50 | $ 249.20 | $ 241.56
Average cost per share - employee surrenders (in dollars per share) | 393.12 | 286.65 | 292.03 | 209.20
Average cost per share - total (in dollars per share) | $ 393.12 | $ 275.53 | $ 250.96 | $ 239.87

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