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Stock-Based Incentive Plans (Tables) | 3 Months Ended
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Mar. 31, 2012
Stock-Based Incentive Plans |
Assumptions used to determine the fair value of stock options granted |
Number |  |  |  | Risk- |  |  |  |  |  |  |  |  |  | Weighted |
of Options |  |  |  | Free |  |  |  |  |  |  |  |  |  | Average |
Granted |  | Grant |  | Interest |  | Dividend |  | Expected |  |  |  |  |  | Fair |
(in thousands) |  | Date |  | Rate |  | Yield |  | Life |  | Volatility |  | Exercise Price |  | Value |
1994 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
1,362 |  | 02/03/11 |  | 2.62 | % | 1.75 | % | 6.2 years |  | 39.0 | % | $ 29.66 to $32.63 |  | $ | 10.33 |
1995 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
30 |  | 02/15/11 |  | 2.92 | % | 1.76 | % | 6.6 years |  | 38.0 | % | $ 29.58 |  | $ | 10.49
Schedule of unvested restricted stock unit activity |
|  |  |  |  |  | Aggregate |
|  |  |  | Weighted- |  | Intrinsic |
|  | Shares |  | Average |  | Value * |
Unvested Restricted Stock Units (RSUs) |  | (in thousands) |  | Price |  | (in thousands) |
Outstanding at January 1, 2012 |  | — |  | $ | — |  |  |
Awarded |  | 361 |  | 33.23 |  |  |
Vested |  | (93 | ) | 33.23 |  |  |
Forfeited |  | (1 | ) | 33.23 |  |  |
Outstanding at March 31, 2012 |  | 267 |  | $ | 33.23 |  | $ | 8,612 |
Outstanding and expected to vest at March 31, 2012 |  | 259 |  | $ | 33.23 |  | $ | 8,356 |
* The intrinsic value is calculated using the closing price per share of $32.25 as reported by the New York Stock Exchange on March 30, 2012.
Summary of stock option activity |
|  |  |  |  |  | Weighted- |  |  |
|  |  |  | Weighted- |  | Average |  | Aggregate |
|  |  |  | Average |  | Remaining |  | Intrinsic |
|  | Shares |  | Exercise |  | Contractual |  | Value * |
Non-Qualified Stock Options |  | (in thousands) |  | Price |  | Life (in years) |  | (in thousands) |
Outstanding at January 1, 2012 |  | 2,134 |  | $ | 31.15 |  |  |  |  |
Exercised |  | (74 | ) | 23.68 |  |  |  |  |
Forfeited |  | (17 | ) | 34.86 |  |  |  |  |
Outstanding at March 31, 2012 |  | 2,043 |  | $ | 31.39 |  | 4.6 |  | $ | 5,105 |
Outstanding and expected to vest at March 31, 2012 |  | 2,000 |  | $ | 31.44 |  | 4.5 |  | $ | 4,976 |
Exercisable at March 31, 2012 |  | 963 |  | $ | 33.82 |  | 3.2 |  | $ | 1,835 |
* 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 $32.25 as reported by the New York Stock Exchange on March 30, 2012.
Summary of unvested stock options activity |
|  |  |  | Weighted- |
|  |  |  | Average |
|  | Shares |  | Grant-Date |
Unvested Options |  | (in thousands) |  | Fair Value |
Unvested at January 1, 2012 |  | 1,242 |  | $ | 10.11 |
Vested |  | (159 | ) | 9.82 |
Forfeited |  | (3 | ) | 10.33 |
Unvested at March 31, 2012 |  | 1,080 |  | $ | 10.15

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- Definition Disclosure of the number and weighted-average grant date fair value for unvested share options (or share units) that were outstanding at the beginning and end of the year, and the number of unvested share options or share units that were granted, vested, forfeited, and expired during the year. + References No definition available. + Details
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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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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