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Stock-Based Incentive Plans | 3 Months Ended
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Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Incentive Plans | Stock-Based Incentive Plans The Company currently has one stock-based incentive plan, which incorporates and supersedes its two previous plans (see Note 1 “Basis of Presentation — Accounting for Stock-Based Compensation”). Participants are granted stock-based awards only if the applicable Company-wide and/or profit-center operating goals, established at the beginning of the year by the Compensation and Leadership Development Committee of the Company's Board of Directors are met. Certain participants may have additional goals based on strategic initiatives of the Company. The fair value of each restricted stock unit award is estimated on the measurement date as determined in accordance with GAAP and is based on the closing market price of the underlying stock on the day preceding the measurement. The fair value excludes the present value of the dividends that the restricted stock units do not participate in. On February 1, 2016, 431,439 restricted stock units were awarded to the Company's employees, including officers, at an estimated value of $32.63 per share, based on the closing price on January 29, 2016. The restrictions on these awards will generally lapse one quarter on the date of the award and one quarter on each of the first, second and third anniversaries of the date of the award, except that restrictions on some of the awards made to each of the Company's named executive officers and certain members of the Company's senior management will lapse fully on the third anniversary of the date of the award. On April 20, 2016, 1,800 restricted stock units were awarded to each of the Company’s six non-employee directors at an estimated value of $38.00 per share based on the closing price on April 19, 2016. There are no restrictions on the non-employee directors’ restricted stock units granted on April 20, 2016. The following table summarizes the Company’s unvested restricted stock unit activity for the three months ended March 31, 2016:
| Shares |  | Weighted- Average Price |  | Aggregate Intrinsic Value *
Unvested Restricted Stock Units (RSUs) | (in thousands) |  |  | (in thousands)
Outstanding at January 1, 2016 | 527 |  |  | $ | 31.56 |  |  |  |
Awarded | 431 |  |  |  |  |  |  |
Vested | (324 | ) |  |  |  |  |  |
Forfeited | (4 | ) |  |  |  |  |  |
Outstanding at March 31, 2016 | 630 |  |  | $ | 31.81 |  |  | $ | 24,048 |
Outstanding and expected to vest at March 31, 2016 | 615 |  |  | $ | 31.81 |  |  | $ | 23,484 |
* | The intrinsic value is calculated using the closing price per share of $38.17 as reported by the New York Stock Exchange on March 31, 2016.
Based on the market value on the award date, the total intrinsic value of vested restricted stock units during the three-month periods ended March 31, 2016 and 2015, was $10.3 million and $9.7 million, respectively. No stock options were granted in 2015 or in the first three months of 2016. As of March 31, 2016, there were no unvested options outstanding. The following table summarizes the Company’s stock option activity for the three months ended March 31, 2016:
|  | Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life |  | Aggregate Intrinsic Value *
Non-Qualified Stock Options |  | (in thousands) |  |  |  | (in years) |  | (in thousands)
Outstanding at January 1, 2016 |  | 523 |  |  | $ | 29.55 |  |  |  |  |  |
Exercised |  | (35 | ) |  |  |  |  |  |  |  |
Forfeited |  | (1 | ) |  |  |  |  |  |  |  |
Outstanding and exercisable at March 31, 2016 |  | 487 |  |  | $ | 29.60 |  |  | 1.8 |  | $ | 4,174 |
* | The intrinsic value represents the amount, if any, by which the fair market value of the underlying common stock exceeds the exercise price of the stock option, using the closing price per share of $38.17 as reported by the New York Stock Exchange on March 31, 2016.
The total intrinsic value of stock options exercised during the three-month periods ended March 31, 2016 and 2015, was $0.2 million and $1.2 million, respectively. As of March 31, 2016, $16.1 million of total unrecognized compensation cost was related to unvested stock-based compensation arrangements under the 2011 Plan for awards made through February 2016. The portions of this cost related to restricted stock units awarded through February 2016 are expected to be recognized over a weighted-average period of 2.3 years.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: 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 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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