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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Equity [Abstract] |  |  |  |
Shares repurchased in the open market (in shares) | 0 | 86 | 721 | 353
Shares acquired through employee surrender for statutory tax withholding (in shares) | 0 | 1 | 30 | 37
Total shares repurchased (in shares) | 0 | 87 | 751 | 390
Cost of shares repurchased in the open market | $ 0 | $ 20,285 | $ 179,623 | $ 74,147
Cost of shares for employee surrenders | 65 | 169 | 8,669 | 7,572
Total cost of shares | $ 65 | $ 20,454 | $ 188,292 | $ 81,719
Average cost per share - open market repurchases (in dollars per share) | $ 0 | $ 235.94 | $ 249.20 | $ 209.81
Average cost per share - employee surrenders (in dollars per share) | 312.19 | 249.77 | 288.94 | 207.16
Average cost per share - total (in dollars per share) | $ 312.19 | $ 236.04 | $ 250.79 | $ 209.56

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