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Stock-Based Incentive Plans (Tables) | 6 Months Ended
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Jun. 30, 2011
Stock-Based Incentive Plans |
Assumptions used to determine the fair value of options granted |
Black-Scholes option pricing model assumptions for options granted in 2011 and 2010 are as follows:
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 |
148 |  |  | 02/02/10 |  | 2.93 | % | 1.62 | % | 6.5 years |  | 36.0 | % | $24.75 |  | $ | 8.46 |
1995 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
30 |  |  | 02/15/11 |  | 2.92 | % | 1.76 | % | 6.6 years |  | 38.0 | % | $29.58 |  | $ | 10.49
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, 2011 |  | 1,124 |  | $ | 34.19 |  |  |  |  |
Granted |  | 1,392 |  | 29.66 |  |  |  |  |
Exercised |  | (7 | ) | 23.74 |  |  |  |  |
Forfeited |  | (16 | ) | 35.69 |  |  |  |  |
Outstanding at June 30, 2011 |  | 2,493 |  | $ | 31.68 |  | 4.6 |  | $ | 1,873 |
Outstanding and expected to vest at June 30, 2011 |  | 2,436 |  | $ | 31.74 |  | 4.6 |  | $ | 1,817 |
Exercisable at June 30, 2011 |  | 1,083 |  | $ | 35.04 |  | 2.2 |  | $ | 773 |
* 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 option, using the closing price per share of $29.87 as reported by the New York Stock Exchange on June 30, 2011.
Summary of unvested options activity |
|  |  |  | Weighted- |
|  |  |  | Average |
|  | Shares |  | Grant-Date |
Unvested Options |  | (in thousands) |  | Fair Value |
Unvested at January 1, 2011 |  | 180 |  | $ | 7.85 |
Granted |  | 1,392 |  | 10.33 |
Vested |  | (161 | ) | 9.88 |
Forfeited |  | (1 | ) | 6.55 |
Unvested at June 30, 2011 |  | 1,410 |  | $ | 10.07 |

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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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