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Repurchases of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Abstract] |  |  |
Shares of common stock repurchases authorized (in shares) | 73,000,000.0 |  |
Remaining shares available for repurchase under authorization (in shares) | 6,300,000 |  |
Share repurchased during the period (in shares) | 721,000 | 1,215,000 | 1,773,000
Shares acquired through employee surrender for statutory tax withholding (in shares) | 58,000 | 39,000 | 52,000
Total shares repurchased (in shares) | 779,000 | 1,254,000 | 1,825,000
Cost of shares repurchased in the open market | $ 179,623 | $ 303,838 | $ 368,691
Cost of shares for employee surrenders | 20,603 | 8,054 | 9,375
Total cost of shares | $ 200,226 | $ 311,892 | $ 378,066
Average cost per share - open market repurchases (in USD per share) | $ 249.20 | $ 249.84 | $ 207.92
Average cost per share - employee surrenders (in USD per share) | 354.98 | 210.10 | 182.18
Average cost per share - total (in USD per share) | $ 257.08 | $ 248.62 | $ 207.19

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