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9. Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
Share-based Compensation [Abstract] |
Stock Options Activity | Stock Options The following table summarizes stock option activity.
|  | Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Outstanding, January 1, 2010 |  | 1,206,374 |  |  | $ | 50.78 |  |  |  |  |
Granted |  | 58,500 |  |  | $ | 84.57 |  |  |  |  |
Exercised |  | (200,125 | ) |  | $ | 26.81 |  |  |  |  |
Forfeited/expired |  | (6,930 | ) |  | $ | 61.08 |  |  |  |  |
Outstanding, December 31, 2010 |  | 1,057,819 |  |  | $ | 57.12 |  |  |  |  |
Granted |  | 58,500 |  |  | $ | 99.49 |  |  |  |  |
Exercised |  | (220,372 | ) |  | $ | 42.44 |  |  |  |  |
Forfeited/expired |  | (7,197 | ) |  | $ | 62.98 |  |  |  |  |
Outstanding, December 31, 2011 |  | 888,750 |  |  | $ | 63.50 |  |  |  |  |
Granted |  | 55,250 |  |  | $ | 107.32 |  |  |  |  |
Exercised |  | (181,707 | ) |  | $ | 44.66 |  |  |  |  |
Forfeited/expired |  | (15,000 | ) |  | $ | 87.78 |  |  |  |  |
Outstanding, December 31, 2012 |  | 747,293 |  |  | $ | 70.83 |  |  | 4.32 |  | $ | 25.7 |
Vested and expected to vest, |  |  |  |  |  |  |  |
December 31, 2012 |  | 732,875 |  |  | $ | 70.28 |  |  | 4.23 |  | $ | 25.6 |
Exercisable, December 31, 2012 |  | 584,943 |  |  | $ | 64.06 |  |  | 3.20 |  | $ | 24.0 |
Stock Options Outstanding | The following summarizes information about stock options outstanding at December 31, 2012:
|  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices |  | Number Outstanding |  | Weighted-Average Remaining Contractual Term (in years) |  | Weighted -Average Exercise Price |  | Number Exercisable |  | Weighted - Average Exercise Price
$ 35.50 - $ 56.40 |  | 202,473 |  |  | 1.42 |  | $ | 53.69 |  |  | 202,473 |  |  | $ | 53.69 |
$ 57.49 - $ 63.00 |  | 225,870 |  |  | 2.92 |  | $ | 61.20 |  |  | 225,870 |  |  | $ | 61.20 |
$ 74.27 - $ 88.48 |  | 210,200 |  |  | 6.05 |  | $ | 80.82 |  |  | 145,900 |  |  | $ | 80.29 |
$ 98.04 - $107.32 |  | 108,750 |  |  | 9.28 |  | $ | 103.44 |  |  | 10,700 |  |  | $ | 99.44 |
Totals |  | 747,293 |  |  |  |  |  |  | 584,943 |  |  |
Stock Options Valuation Assumptions | The weighted-average fair value of stock options granted was estimated using a Black-Scholes option-pricing model with the following weighted-average assumptions:
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
Expected volatility |  | 30 | % |  | 32 | % |  | 35 | %
Risk-free interest rate |  | 1.53 | % |  | 1.71 | % |  | 2.40 | %
Expected life (in years) |  | 9.0 |  |  | 8.6 |  |  | 8.7 |
Expected dividend |  | — |  |  | — |  |  | — |
Weighted-average fair value of options granted |  | $ | 41.82 |  |  | $ | 40.81 |  |  | $ | 38.19 |
Resticted Stock Activity | The following table summarizes restricted stock activity:
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
|  | Restricted Stock Shares |  | Weighted- Average Grant-Date Fair Value |  | Restricted Stock Shares |  | Weighted- Average Grant-Date Fair Value |  | Restricted Stock Shares |  | Weighted- Average Grant-Date Fair Value
Nonvested shares, at |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
beginning of year |  | 39,629 |  |  | $ | 84.07 |  |  | 68,893 |  |  | $ | 83.21 |  |  | 101,247 |  |  | $ | 82.86 |
Vested |  | (25,124 | ) |  | $ | 81.98 |  |  | (26,179 | ) |  | $ | 81.98 |  |  | (28,518 | ) |  | $ | 81.94 |
Cancelled/forfeited |  | (1,548 | ) |  | $ | 84.20 |  |  | (3,085 | ) |  | $ | 82.63 |  |  | (3,836 | ) |  | $ | 83.47 |
Nonvested shares, at |  |  |  |  |  |  |  |  |  |  |  |  |
end of year |  | 12,957 |  |  | $ | 88.09 |  |  | 39,629 |  |  | $ | 84.07 |  |  | 68,893 |  |  | $ | 83.21 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | The following table summarizes restricted stock unit activity:
|  | Restricted Stock Units |  | Weighted- Average Grant-Date Fair Value |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value as of December 31, 2012 (in millions)
Outstanding, January 1, 2010 |  | 163,198 |  |  | $ | 77.01 |  |  |  |  |
Granted |  | 126,330 |  |  | $ | 84.57 |  |  |  |  |
Vested |  | (33,825 | ) |  | $ | 78.41 |  |  |  |  |
Forfeited |  | (13,481 | ) |  | $ | 79.71 |  |  |  |  |
Outstanding, December 31, 2010 |  | 242,222 |  |  | $ | 80.61 |  |  |  |  |
Granted |  | 127,920 |  | $ | — |  | $ | 98.25 |  |  |  |  |
Vested |  | (54,350 | ) | $ | — |  | $ | 79.67 |  |  |  |  |
Forfeited |  | (16,430 | ) | $ | 0.08 |  | $ | 80.70 |  |  |  |  |
Outstanding, December 31, 2011 |  | 299,362 |  | $ | — |  | $ | 88.31 |  |  |  |  |
Granted |  | 138,840 |  | $ | — |  | $ | 107.32 |  |  |  |  |
Vested |  | (75,466 | ) | $ | — |  | $ | 85.52 |  |  |  |  |
Forfeited |  | (14,235 | ) | $ | 0.08 |  | $ | 89.31 |  |  |  |  |
Outstanding, December 31, 2012 |  | 348,501 |  | $ | — |  | $ | 96.45 |  |  | 2.17 |  | $ | 36.6 |
Employee Stock Purchase Plan, Valuation Assumptions | The fair value of the employees’ purchase rights under the 2011 ESPP and the 1988 ESPP was estimated using a Black-Scholes model with the following weighted-average assumptions:
| Year Ended December 31,
| 2012 |  |  |  | 2011 |  |  |  | 2010
Expected volatility | 27 | % |  |  |  | 20 | % |  |  |  | 23 | %
Risk-free interest rate | 0.07 | % |  |  |  | 0.06 | % |  |  |  | 0.15 | %
Expected life (in years) | 0.25 |  |  |  |  | 0.25 |  |  |  |  | 0.25 |
Expected dividend | — |  |  |  |  | — |  |  |  |  | — |
Weighted-average fair value |  |  |  |  |  |  |  |  |
of purchase rights | $ | 20.70 |  |  |  |  | $ | 20.35 |  |  |  |  | $ | 18.27 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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