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Share-Based Compensation | 3 Months Ended
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Mar. 31, 2014
Share-Based Compensation [Abstract] |
Share-Based Compensation | NOTE 3. SHARE-BASED COMPENSATION The fair value of options, restricted stock units, deferred stock units and employee stock purchase rights awarded during the three months ended March 31, 2014 and 2013 totaled $20.3 million and $16.6 million, respectively. T he total unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards outstanding at March 31, 2014 was $49.1 million, which will be recognized over a weighted average period of approximately 2.3 years. We determine the assumptions used in the valuation of option awards as of the date of grant. Differences in the expected stock price volatility, expected term or risk-free interest rate may necessitate distinct valuation assumptions at each grant date. As such, we may use different assumptions for options granted throughout the year. Option awards are granted with an exercise price equal to the closing market price of our common stock at the date of grant. We have never paid any cash dividends on our comm on stock, and we have no intention to pay such a dividend at this time; therefore, we assume that no dividends will be paid over the expected terms of option awards. The weighted averages of the valuation assumptions used to determine the fair value of each option award on the date of grant and the weighted average estimated fair values were as follows:
|  |  |  |  |  | For the Three Months Ended March 31,
|  |  |  |  |  |  | 2014 |  |  |  | 2013 |
Expected stock price volatility |  |  |  |  |  |  | 28 | % |  |  | 33 | %
Expected term, in years 1 |  |  |  |  |  |  | 5.7 |  |  |  | 4.6 |
Risk-free interest rate |  |  |  |  |  |  | 1.5 | % |  |  | 0.9 | %
Weighted average fair value of options granted |  |  |  |  |  | $ | 35.94 |  |  | $ | 26.58 |
1 Options granted during the three months ended March 31, 2014 and 2013 have a contractual term of ten and seven years, respectively.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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