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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock Based Compensation Activity Related to Nonvested RSUs | The following table summarizes activity related to nonvested RSUs:
|  | Number of RSUs (In thousands) |  | Weighted Average Grant-Date Fair Value Per Share
Nonvested at December 31, 2015 |  | 1,236 |  |  |  | $ | 134.87 |  |
Granted |  | 679 |  |  |  | 206.69 |  |
Vested |  | (1,009 | ) |  |  | 137.62 |  |
Forfeited |  | (118 | ) |  |  | 203.65 |  |
Nonvested at December 31, 2016 |  | 788 |  |  |  | $ | 183.00 |  |
Granted |  | 519 |  |  |  | 254.58 |  |
Vested |  | (624 | ) |  |  | 201.65 |  |
Forfeited |  | (32 | ) |  |  | 223.23 |  |
Nonvested at December 31, 2017 |  | 651 |  |  |  | $ | 220.21 |  |
Granted |  | 406 |  |  |  | 353.99 |  |
Vested |  | (470 | ) |  |  | 271.50 |  |
Forfeited |  | (24 | ) |  |  | 282.07 |  |
Nonvested at December 31, 2018 |  | 563 |  |  |  | $ | 271.23 |  |
Stock Options |

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- Definition Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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