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Stock-Based Incentive Plans | 6 Months Ended
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Jun. 30, 2017
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, the 2011 Plan, which incorporates and supersedes its two previous plans except for awards previously granted under the two plans (see "Note 1 Basis of Presentation — Accounting for Stock-Based Compensation”). Generally, participants of the 2011 Plan have been granted stock-based awards, only if the applicable Company-wide and/or profit-center operating goals, or strategic goals, established by the Compensation and Leadership Development Committee (the "Committee") of the Company's Board of Directors ("the Board") at the beginning of the year, were met. In 2017, some of the grants made will vest only if Company-wide and/or profit-center operating goals established by the Committee at the beginning of the year are met. The Company granted restricted stock units (“RSUs”) under the 2011 Plan in 2015, 2016 and 2017. 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 Company's common stock on the day of the grant or the immediately preceding the trading date. The fair value excludes the present value of the dividends that the RSUs do not participate in. The RSUs may be time-based, performance-based or time- and performance-based. The restrictions on the time-based RSUs granted to our named executive officers and certain members of our senior management in 2017 and prior generally lapse on the date of the award and each of the first, second and third anniversaries of the date of the award. The restrictions on the time-based RSUs granted in 2017 generally lapse on the first, second, third and fourth anniversaries of the date of the award. The restrictions on the performance-based RSUs granted to our named executive officers and certain members of the Company’s senior management in 2017 and prior, in addition to their time-based RSUs, generally lapse following a performance period set for the RSUs on the date of the award, and shares of our common stock underlying such awards are subject to performance-based adjustment before becoming vested. In addition, the restrictions on the time- and performance-based RSUs granted to our employees in 2017 generally lapse on the first, second, third and fourth anniversaries of the date of the award, provided that the applicable performance goals are achieved within the year of grant. Generally, performance-based awards (including time- and performance-based awards) granted under the 2011 Plan may vest following the end of the performance periods only if the applicable performance goals are achieved within such periods. Under the 2011 Plan, or the applicable grant agreement, the vesting of RSUs granted thereunder may accelerate in four situations: (1) retirement after meeting certain age and/or service tenure conditions, (2) death, (3) disability, and (4) certain situations linked to a change in our control or our sale of assets. In case of early vesting of performance-based awards in any one of the four situations, shares of the underlying stock that could eventually vest in favor of the officer will be prorated based on the early-vesting date and the date when the applicable vesting period is scheduled to expire. On February 4, 2017, 606,299 RSUs were awarded to the Company's employees, including officers, at an estimated fair value of $43.42 per share, based on the closing price on February 4, 2017. On May 16, 2017, 10,066 RSUs were awarded to each of the Company's seven independent directors at an estimated value of $41.52 per share based on the closing price of shares of the Company's common stock on May 15, 2017, which RSUs vested fully on the date of the grant. The following table summarizes changes to the Company’s unvested RSUs for the six months ended June 30, 2017:
| Shares |  | Weighted- Average Price |  | Aggregate Intrinsic Value *
Unvested Restricted Stock Units (RSUs) | (in thousands) |  |  | (in thousands)
Outstanding at January 1, 2017 | 615 |  |  | $ | 31.81 |  |  | 26,915 |
Awarded | 616 |  |  |  |  |  |  |
Vested | (327 | ) |  |  |  |  |  |
Forfeited | (20 | ) |  |  |  |  |  |
Outstanding at June 30, 2017 | 884 |  |  | $ | 36.95 |  |  | $ | 38,645 |
Outstanding and expected to vest at June 30, 2017 | 861 |  |  | $ | 36.91 |  |  | $ | 37,643 |
* | The intrinsic value is calculated using the closing price per share of $43.71 of the underlying Company's common stock as reported by the New York Stock Exchange on June 30, 2017.
The total intrinsic value of RSUs vested during the six-month periods ended June 30, 2017 and 2016, was $11.3 million and $10.7 million, respectively, based on the market value on the award date. No stock options were granted in 2016 or in the first six months of 2017. The following table summarizes the changes to the Company’s outstanding non-qualified stock options for the six months ended June 30, 2017:
|  | 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, 2017 |  | 251 |  |  | $ | 29.66 |  |  | 1.1 |  | 3,558 |
Exercised |  | (44 | ) |  |  |  |  |  |  |  |
Forfeited |  | — |  |  |  |  |  |  |  |  |
Outstanding and exercisable at June 30, 2017 |  | 207 |  |  | $ | 29.66 |  |  | 0.6 |  | $ | 2,913 |
* | The intrinsic value represents the amount, if any, by which the fair market value of the underlying Company's common stock exceeds the exercise price of the stock option, using the closing price per share of $43.71 such stock as reported by the New York Stock Exchange on June 30, 2017.
The total intrinsic value of stock options exercised was $0.5 million and $0.7 million during six-month periods ended June 30, 2017 and 2016, respectively. As of June 30, 2017, there was $17.8 million unrecognized cost related to unvested stock-based compensation arrangements under the 2011 Plan for awards made through February 2017. The portion of this cost related to RSUs awarded through May 2017 (as discussed above) is expected to be recognized over a weighted-average period of 2.4 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=65895303&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=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: 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 5: 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 6: 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 + Details
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