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Repurchases of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity [Abstract] |  |  |
Shares of common stock repurchases authorized (in shares) | 68,000,000.0 |  |
Remaining shares available for repurchase under authorization (in shares) | 2,000,000.0 |  |
Share repurchased during the period (in shares) | 1,215,000 | 1,773,000 | 1,749,000
Shares acquired through employee surrender for statutory tax withholding (in shares) | 39,000 | 52,000 | 57,000
Total shares repurchased (in shares) | 1,254,000 | 1,825,000 | 1,806,000
Cost of shares repurchased in the open market | $ 303,838 | $ 368,691 | $ 270,297
Cost of shares for employee surrenders | 8,054 | 9,375 | 8,074
Total cost of shares | $ 311,892 | $ 378,066 | $ 278,371
Average cost per share - open market repurchases (in USD per share) | $ 249.84 | $ 207.92 | $ 154.51
Average cost per share - employee surrenders (in USD per share) | 210.10 | 182.18 | 142.55
Average cost per share - total (in USD per share) | $ 248.62 | $ 207.19 | $ 154.13

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