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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of unvested restricted stock unit activity | The following table summarizes the Company’s unvested restricted stock unit activity for the year ended December 31, 2015:
| Shares (in thousands) |  | Weighted- Average Price |  | Aggregate Intrinsic Value * (in thousands)
Unvested Restricted Stock Units (RSUs) |  |
Outstanding at January 1, 2015 | 504 |  |  | $ | 31.67 |  |  | $ | 17,423 |
Awarded | 351 |  |  | 31.80 |  |  |  |
Vested | (322 | ) |  | 31.99 |  |  |  |
Forfeited | (6 | ) |  | 31.55 |  |  |  |
Outstanding at December 31, 2015 | 527 |  |  | $ | 31.56 |  |  | $ | 17,994 |
Outstanding and expected to vest at December 31, 2015 | 515 |  |  | $ | 31.56 |  |  | $ | 17,584 |
* The intrinsic value is calculated using the closing price per share of $34.15, as reported by the New York Stock Exchange on December 31, 2015.
Summary of stock option activity | The following table summarizes the Company’s stock option activity for the year ended December 31, 2015:
| Shares (in thousands) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life |  | Aggregate Intrinsic Value* (in thousands)
Non-Qualified Stock Options |  |  |
Outstanding at January 1, 2015 | 855 |  |  | $ | 29.48 |  |  | 3.1 |  | $ | 4,381 |
Exercised | (330 | ) |  | $ | 29.37 |  |  |  |  |  |
Forfeited | (2 | ) |  | $ | 29.66 |  |  |  |  |
Outstanding and exercisable at December 31, 2015 | 523 |  |  | $ | 29.55 |  |  | 2.1 |  | $ | 2,406 |
* The intrinsic value represents the amount by which the fair market value of the underlying common stock exceeds the exercise price of the option, using the closing price per share of $34.15, as reported by the New York Stock Exchange on December 31, 2015.

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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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