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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Weighted Average Assumptions Use in Calculation of Fair Value for Service and Performance Conditions SARs Awards | The following table summarizes the weighted-average assumptions used in the calculation of the fair value for service condition SARs awards for the years ended December 31, 2017, and 2016:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |
Expected volatility |  |  | 49.2 | % |  |  | 49.6 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.1 | %
Expected term |  | 6.0 years |  |  | 6.0 years |
Risk-free interest rate |  |  | 2.2 | % |  |  | 1.2 | %
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |
Expected volatility |  |  | 49.6 | % |  |  | 49.6 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Expected term |  | 6.1 years |  |  | 6.0 years |
Risk-free interest rate |  |  | 2.2 | % |  |  | 1.2 | %
Summary of Activities Under Share-Based Compensation Plans | The following table summarizes the activities for SARs under all share-based compensation plans for the year ended December 31, 2018:
|  | Number of Awards |  |  | Weighted-Average Exercise Price Per Award |  |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value(1) |
|  | (in thousands) |  |  |  |  |  |  |  |  | (in millions) |
Outstanding as of December 31, 2017(2)(3) |  |  | 19,193 |  |  | $ | 23.36 |  |  | 6.2 years |  | $ | 212.0 |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |
Exercised(4) |  |  | (10,369 | ) |  | $ | 20.34 |  |  |  |  |  |  |
Forfeited(5) |  |  | (354 | ) |  | $ | 28.91 |  |  |  |  |  |  |
Outstanding as of December 31, 2018(2)(3) |  |  | 8,470 |  |  | $ | 26.82 |  |  | 6.1 years |  | $ | 272.1 |
Exercisable as of December 31, 2018(6) |  |  | 5,220 |  |  | $ | 25.03 |  |  | 5.0 years |  | $ | 177.1 |
Vested and expected to vest as of December 31, 2018 |  |  | 8,279 |  |  | $ | 26.76 |  |  | 6.0 years |  | $ | 266.5 |
(1) | The intrinsic value is the amount by which the current market value of the underlying stock exceeds the exercise price of the stock awards.
(2) | Includes less than 0.1 million and 0.2 million market condition SARS as of December 31, 2018 and 2017, respectively.
(3) | Includes 3.1 million and 6.2 million performance condition SARs as of December 31, 2018 and 2017, respectively.
(4) | Includes 0.2 million market condition and 3.0 million performance condition SARs.
(5) | Includes 0.1 million performance condition SARs.
(6) | Includes less than 0.1 million market condition and 1.8 million performance condition SARs.
The following table summarizes the activities for stock units under all share-based compensation plans for the year ended December 31, 2018:
|  | Number of Shares |  |  | Weighted-Average Grant Date Fair Value Per Share |
|  | (in thousands) |  |  |  |  |
Outstanding and nonvested as of December 31, 2017(1) |  |  | 326 |  |  | $ | 34.34 |
Granted(2) |  |  | 1,386 |  |  | $ | 43.75 |
Vested |  |  | (44 | ) |  | $ | 35.62 |
Forfeited |  |  | (57 | ) |  | $ | 43.15 |
Outstanding and nonvested as of December 31, 2018(1) |  |  | 1,611 |  |  | $ | 42.09 |
Expected to vest as of December 31, 2018(3) |  |  | 1,111 |  |  | $ | 43.47 |
(1) | Includes 708,836 and 268,776 performance based stock unit awards as of December 31, 2018 and 2017, respectively, which represents the maximum amount that can vest.
(2) | Includes 440,060 performance-based stock unit awards, which represents the maximum amount that can vest.
(3) | Includes 261,297 performance-based stock unit awards.

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- Definition Weighted average assumptions use in calculation of fair value for service and performance conditions awards. + References No definition available. + Details
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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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