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Stock-Based Compensation
9 Months Ended
Sep. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] 
Stock-Based Compensation
Stock-Based Compensation

The Company recorded approximately $2.9 million and $8.4 million of stock-based compensation expense for the three and nine months ended September 30, 2011, respectively. The Company recorded approximately $1.8 million and $6.9 million of stock-based compensation expense for the three and nine months ended September 30, 2010, respectively. As of September 30, 2011, there was approximately $13.3 million of total unrecognized compensation costs related to non-vested share-based employee compensation arrangements granted under the Company's equity compensation plans. The Company expects to recognize this cost over a weighted average period of 1.35 years.

During the nine months ended September 30, 2011, the Company issued a total of 629,816 shares of its common stock upon the exercise of stock options, pursuant to restricted stock grants and pursuant to purchases under its 2010 employee stock purchase plan (the 2010 ESPP). During the nine months ended September 30, 2010, the Company issued a total of 543,460 shares of its common stock upon the exercise of stock options, pursuant to restricted stock grants and pursuant to purchases under its 2000 employee stock purchase plan (the 2000 ESPP). Cash received from the exercise of stock options and purchases through the 2010 ESPP during the nine months ended September 30, 2011 and the exercise of stock options and purchases through the 2000 ESPP during the nine months ended September 30, 2010 was approximately $4.0 million and $2.8 million, respectively, and is included within the financing activities section of the consolidated statements of cash flows.

At September 30, 2011, there were no shares reserved for future issuance under the 2000 ESPP and 5,171,643 shares of common stock reserved for future issuance under the 2010 ESPP and for future grants under the Company's amended and restated 2004 stock incentive plan.