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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, 2020 | Mar. 31, 2019
Equity [Abstract] |  |
Shares repurchased in the open market (in shares) | 721 | 267
Shares acquired through employee surrender for statutory tax withholding (in shares) | 30 | 36
Total shares repurchased (in shares) | 751 | 303
Cost of shares repurchased in the open market | $ 179,623 | $ 53,862
Cost of shares for employee surrenders | 8,604 | 7,403
Total cost of shares | $ 188,227 | $ 61,265
Average cost per share - open market repurchases (in dollars per share) | $ 249.20 | $ 201.41
Average cost per share - employee surrenders (in dollars per share) | 288.78 | 206.35
Average cost per share - total (in dollars per share) | $ 250.77 | $ 202.00

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