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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2011
Share-Based Compensation [Abstract] |
Stock Option Activity | The following is a summary of the stock option activity under our share-based plans for the year ended December 31, 2011:
|  | Shares |  |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value
Balance at December 31, 2010 |  | 5,255,165 |  | $ | 22.08 |  |  |  |  |
Granted |  | 404,500 |  |  | 24.50 |  |  |  |  |
Exercised |  | (958,509 | ) |  | 12.70 |  |  |  |  |
Forfeited |  | (31,919 | ) |  | 19.30 |  |  |  |  |
Balance at December 31, 2011 |  | 4,669,237 |  | $ | 24.23 |  | 5.07 |  | $ | 35,441,126
Exercisable at December 31, 2011 |  | 2,595,660 |  | $ | 25.44 |  | 3.23 |  | $ | 18,372,236
Stock options outstanding and exercisable by exercise price range | The table below summarizes information about stock options outstanding and exercisable at December 31, 2011:
|  | Outstanding Stock Options |  | Exercisable Stock Options
|  |  | Weighted Average |  |  |  |
|  |  | Remaining | Weighted |  |  | Weighted
|  |  | Contractual Term | Average |  |  | Average
Range of exercise prices |  | Shares | (Years) | Exercise Price |  | Shares | Exercise Price
$ 0.00 to $ 11.99 |  | 449,960 | 1.12 | $ | 11.98 |  | 449,960 | $ | 11.98
$ 12.00 to $ 17.99 |  | 166,696 | 0.31 |  | 13.38 |  | 166,696 |  | 13.38
$ 18.00 to $ 23.99 |  | 2,219,973 | 6.08 |  | 20.17 |  | 803,184 |  | 21.09
$ 24.00 to $ 29.99 |  | 451,966 | 8.61 |  | 24.69 |  | 49,466 |  | 26.21
$ 30.00 to $ 47.30 |  | 1,380,642 | 4.14 |  | 35.92 |  | 1,126,354 |  | 35.66
|  | 4,669,237 | 5.07 | $ | 24.23 |  | 2,595,660 | $ | 25.44
Summary of cash proceeds and tax benefits realized from stock option exercise. | The following table summarizes the cash proceeds and tax benefits realized from the exercise of stock options:
|  | Year Ended December 31,
(in thousands, except share amounts) |  | 2011 |  |  | 2010 |  |  | 2009 |
Options exercised |  | 958,509 |  |  | 650,210 |  |  | 557,252 |
Cash proceeds | $ | 12,173 |  | $ | 5,411 |  | $ | 3,439 |
Intrinsic value of options exercised | $ | 13,868 |  | $ | 8,589 |  | $ | 7,870 |
Tax benefits realized | $ | 5,409 |  | $ | 3,375 |  | $ | 3,093 |
Summary of assumptions for estimated fair value of employee stock option awards at grant date | We estimated the fair value of employee stock option awards at the grant date based on the assumptions summarized in the following table:
|  | Year Ended December 31,
(Weighted average) |  | 2011 |  | 2010 |  | 2009
Expected volatility |  | 37.9 | % |  | 38.9 | % |  | 36.6 | %
Expected term |  | 7.8 | years |  | 6.7 | years |  | 6.7 | years
Risk-free interest rate |  | 3.10 | % |  | 3.23 | % |  | 2.94 | %
Expected dividend yield |  | 2.0 | % |  | 2.0 | % |  | 2.0 | %
Grant date fair value | $ | 8.97 |  | $ | 7.34 |  | $ | 6.18 |
Summary of share-based compensation expense and recognized tax benefits | The table below presents the total share-based compensation expense for stock option awards and the related recognized tax benefits for the past three years (in thousands):
|  | 2011 |  |  | 2010 |  |  | 2009
Share-based compensation expense | $ | 4,497 |  | $ | 4,570 |  | $ | 4,681
Recognized tax benefits |  | 1,721 |  |  | 1,796 |  |  | 1,840
The table below presents the total share-based compensation expense for restricted stock awards for the past three years (in thousands):
|  | 2011 |  |  | 2010 |  |  | 2009
Share-based compensation expense | $ | 3,507 |  | $ | 3,028 |  | $ | 1,560
Summary of restricted stock award activity | The following is a summary of the restricted stock awards activity under our share-based plans for the year ended December 31, 2011:
|  | Shares |  | Weighted Average Grant Date Fair Value
Balance unvested at December 31, 2010 |  | 418,621 |  | $ | 21.49
Granted (at market price) |  | 126,725 |  |  | 25.74
Vested |  | (32,856 | ) |  | 24.71
Forfeited |  | (7,200 | ) |  | 19.66
Balance unvested at December 31, 2011 |  | 505,290 |  | $ | 22.37
Total restricted stock awards that vested for the past three years and related fair value | The table below presents the total number of restricted stock awards that vested for the past three years and the related fair value of those awards (in thousands, except share amounts):
|  | 2011 |  |  | 2010 |  |  | 2009
Shares vested |  | 32,856 |  |  | 44,152 |  |  | 58,748
Fair value of restricted stock awards vested | $ | 812 |  | $ | 1,077 |  | $ | 1,010
Number of shares purchased by employees under the employee stock purchase plan | For the two six month offering periods in each year presented below, our employees purchased the following aggregate number of shares:
| 2011 |  |  | 2010 |  |  | 2009
| 37,653 |  |  | 48,002 |  |  | 57,839

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- Definition Tabular disclosure of the amount of cash proceeds received from the exercise of stock options and similar instruments granted under share-based payment arrangements and the tax benefit realized from stock options exercised during the period. Disclosure may also include the intrinsic value of stock options exercised during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (j) -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 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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- Definition Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (e) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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