STOCK-BASED COMPENSATION
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Jun. 30, 2012
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Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | STOCK-BASED COMPENSATION The following table summarizes the amount of stock-based compensation included in the Condensed consolidated statements of operations:
Stock Options The following is a summary of the Company’s stock option activity during the three months ended June 30, 2012:
The total intrinsic value of options exercised during the three months ended June 30, 2012 and 2011 was $0.8 million and $9.1 million, respectively. Intrinsic value is defined as the amount by which the fair value of the underlying stock exceeds the exercise price at the time of option exercise. The total cash received as a result of stock option exercises during the three months ended June 30, 2012 was $1.3 million. As of June 30, 2012, total unrecognized compensation cost related to unvested stock options was $9.7 million, which is expected to be recognized over a weighted average period of 2.0 years. Restricted Stock The following is a summary of the Company’s restricted stock activity dring the three months ended June 30, 2012:
The weighted average grant-date fair value of awards of restricted stock and restricted stock units (collectively "restricted stock") is based on the quoted market price of the Company's common stock on the date of grant. The weighted average grant-date fair value of restricted stock granted during the three months ended June 30, 2012 and 2011 was $31.10 and $36.60, respectively. The total fair value of restricted stock that vested during the three months ended June 30, 2012 and 2011 was $3.7 million and $1.3 million, respectively. As of June 30, 2012, total unrecognized compensation cost related to unvested restricted stock was $25.4 million, which is expected to be recognized over a weighted average period of 2.9 years. Valuation Assumptions The Company estimates the fair value of stock options and Employee Stock Purchase Plan (“ESPP”) shares using a Black-Scholes option valuation model. The fair value of stock options granted during the respective periods is estimated on the date of grant using the following weighted average assumptions:
The Company recognizes the grant-date fair value of stock-based compensation as compensation expense using the straight-line attribution approach over the service period for which the stock-based compensation is expected to vest. No purchase rights were granted under the ESPP during the three months ended June 30, 2012 and 2011. |