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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Weighted Average Assumptions Use in Calculation of Fair Value for Service and Performance Conditions Awards | The following table summarizes the weighted average assumptions used in the calculation of the fair value for service condition awards for the years ended December 31, 2016, 2015, and 2014:
|  | SARs |  |
|  | Year Ended December 31, |  |
|  | 2016 |  |  | 2015 |  |  | 2014 |  |
Expected volatility |  |  | 49.6 | % |  |  | 48.7 | % |  |  | 51.5 | % |
Dividends yield |  |  | 0.1 | % |  |  | 1.6 | % |  |  | 1.3 | % |
Expected term |  | 6.0 years |  |  | 5.8 years |  |  | 5.6 years |  |
Risk-free interest rate |  |  | 1.2 | % |  |  | 1.6 | % |  |  | 1.7 | % |
|  | SARs |
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Expected volatility |  |  | 49.6 | % |  |  | 48.8 | % |  |  | 52.0 | %
Dividends yield |  |  | 0.0 | % |  |  | 1.6 | % |  |  | 1.3 | %
Expected term |  | 6.0 years |  |  | 5.8 years |  |  | 5.6 years |
Risk-free interest rate |  |  | 1.2 | % |  |  | 1.6 | % |  |  | 1.7 | %
Summary of Activity Under Share-Based Compensation Plans | The following tables summarize the activity under all share-based compensation plans, which includes all stock awards, for the year ended December 31, 2016:
Stock Options & SARs |  | Awards |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value(1) |
|  | (In thousands) |  |  |  |  |  |  |  |  | (In millions) |
Outstanding at December 31, 2015(2) (3) |  |  | 12,076 |  |  | $ | 38.70 |  |  | 6.6 years |  | $ | 216.4 |
Granted |  |  | 1,400 |  |  | $ | 62.21 |  |  |  |  |  |  |
Exercised |  |  | (1,126 | ) |  | $ | 33.63 |  |  |  |  |  |  |
Forfeited |  |  | (352 | ) |  | $ | 52.29 |  |  |  |  |  |  |
Outstanding at December 31, 2016(2) (3) |  |  | 11,998 |  |  | $ | 41.52 |  |  | 6.0 years |  | $ | 148.7 |
Exercisable at December 31, 2016(4) |  |  | 7,136 |  |  | $ | 38.80 |  |  | 4.5 years |  | $ | 106.8 |
(1) | The intrinsic value is the amount by which the current market value of the underlying stock exceeds the exercise price of the stock award.
(2) | Includes 0.1 million and 0.1 million market condition SARS as of December 31, 2016 and 2015, respectively.
(3) | Includes 2.9 million and 2.5 million performance condition SARs as of December 31, 2016 and 2015, respectively.
(4) | Includes 0.9 million performance condition SARs.
The following table summarizes the activities for stock units, primarily relating to directors of the Company, for the year ended December 31, 2016:
Incentive Plan and Independent Directors Stock Units |  | Shares |  |  | Weighted Average Grant Date Fair Value |
|  | (In thousands) |  |  |  |  |
Outstanding and nonvested at December 31, 2015 |  |  | 34 |  |  | $ | 51.08 |
Granted |  |  | 27 |  |  | $ | 62.30 |
Vested |  |  | (35 | ) |  | $ | 51.37 |
Forfeited |  | — |  |  |  |  |
Outstanding and nonvested at December 31, 2016 |  |  | 26 |  |  | $ | 62.35 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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