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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Equity [Abstract] |  |  |  |
Shares repurchased in the open market (in shares) | 330 | 302 | 683 | 1,284
Shares acquired through employee surrender for statutory tax withholding (in shares) | 1 | 1 | 38 | 50
Total shares repurchased (in shares) | 331 | 303 | 721 | 1,334
Cost of shares repurchased in the open market | $ 91,051 | $ 73,247 | $ 165,198 | $ 265,209
Cost of shares for employee surrenders | 277 | 390 | 7,849 | 9,110
Total cost of shares | $ 91,328 | $ 73,637 | $ 173,047 | $ 274,319
Average cost per share - open market repurchases (in dollars per share) | $ 275.50 | $ 242.78 | $ 241.56 | $ 206.59
Average cost per share - employee surrenders (in dollars per share) | 286.65 | 253.34 | 209.20 | 181.68
Average cost per share - total (in dollars per share) | $ 275.53 | $ 242.83 | $ 239.87 | $ 205.65

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