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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Activity Under Share-Based Compensation Plans | The following tables summarize the activity under all share-based compensation plans for the three months ended March 31, 2017:
SARs |  | Awards |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value(1) |
|  | (In thousands) |  |  |  |  |  |  |  |  | (In millions) |
Outstanding at December 31, 2016(2)(3) |  |  | 11,998 |  |  | $ | 41.52 |  |  | 6.0 years |  | $ | 148.7 |
Granted |  |  | 1,345 |  |  | $ | 57.19 |  |  |  |  |  |  |
Exercised |  |  | (481 | ) |  | $ | 21.39 |  |  |  |  |  |  |
Forfeited |  |  | (34 | ) |  | $ | 54.97 |  |  |  |  |  |  |
Outstanding at March 31, 2017(2) (3) |  |  | 12,828 |  |  | $ | 43.88 |  |  | 6.4 years |  | $ | 211.4 |
Exercisable at March 31, 2017(4) |  |  | 7,223 |  |  | $ | 39.34 |  |  | 4.7 years |  | $ | 157.1 |
(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 0.1 million market condition SARs as of both March 31, 2017 and December 31, 2016.
(3) | Includes 3.3 million and 2.9 million performance condition SARs as of March 31, 2017 and December 31, 2016, respectively.
(4) | Includes 1.1 million performance condition SARs.
Incentive Plan and Independent Directors Stock Units |  | Shares |  |  | Weighted Average Grant Date Fair Value |
|  | (In thousands) |  |  |  |  |
Outstanding and nonvested December 31, 2016 |  |  | 26 |  |  | $ | 62.35 |
Granted |  | — |  |  | — |
Vested |  |  | (1 | ) |  | $ | 61.14 |
Forfeited |  | — |  |  | — |
Outstanding and nonvested March 31, 2017 |  |  | 25 |  |  | $ | 62.37 |

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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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