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Repurchases of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity [Abstract] |  |  |
Shares of common stock repurchases authorized (in shares) | 68,000,000 |  |
Remaining shares available for repurchase under authorization (in shares) | 3,200,000 |  |
Share repurchased during the period (in shares) | 1,773,000 | 1,749,000 | 3,071,000
Shares acquired through employee surrender for statutory tax withholding (in shares) | 52,000 | 57,000 | 60,000
Total shares repurchased (in shares) | 1,825,000 | 1,806,000 | 3,131,000
Cost of share repurchased in the open market | $ 368,691 | $ 270,297 | $ 313,072
Cost of shares for employee surrenders | 9,375 | 8,074 | 4,372
Total cost of shares | $ 378,066 | $ 278,371 | $ 317,444
Average cost per share - open market repurchases (in USD per share) | $ 207.92 | $ 154.51 | $ 101.96
Average cost per share - employee surrenders (in USD per share) | 182.18 | 142.55 | 73.04
Average cost per share - total (in USD per share) | $ 207.19 | $ 154.13 | $ 101.40

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- Definition Open market common stock repurchases. + References No definition available. + Details
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- Definition The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References No definition available. + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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