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Stock-Based Incentive Plans (Tables) | 6 Months Ended
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Jun. 30, 2017
Restricted Stock |
Stock-Based Compensation |
Schedule of unvested restricted stock unit activity | 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.
Non-Qualified Stock Options |
Stock-Based Compensation |
Summary of stock option activity | 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.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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