Stock-Based Compensation

9 Months Ended

Sep. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock-Based Compensation

The Company recorded approximately $5.4 million and $15.9 million of stock-based compensation expense for the three and nine months ended September 30, 2013, respectively. The Company recorded approximately $3.8 million and $11.1 million of stock-based compensation expense for the three and nine months ended September 30, 2012, respectively. As of September 30, 2013, there was approximately $26.2 million of total unrecognized compensation costs related to non-vested stock-based employee compensation arrangements granted under the Company's equity compensation plans. The Company expects to recognize those costs over a weighted average period of 1.40 years.

During the nine months ended September 30, 2013, the Company issued a total of 9,733,369 shares of its common stock upon the exercise of stock options, pursuant to restricted stock grants and pursuant to purchases under the Company's 2010 employee stock purchase plan (2010 ESPP). During the nine months ended September 30, 2012, the Company issued a total of 1,660,194 shares of its common stock upon the exercise of stock options, pursuant to restricted stock grants and pursuant to purchases under the 2010 ESPP. Cash received from the exercise of stock options and purchases through the 2010 ESPP during the nine months ended September 30, 2013 and September 30, 2012 was approximately $59.2 million and $20.1 million, respectively, and is included within the financing activities section of the consolidated statements of cash flows.