Share-Based Compensation

6 Months Ended

Jun. 30, 2015

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

Share-Based Compensation

Share-Based Compensation

The Company recorded approximately $8.7 million and $8.9 million of share-based compensation expense for the three months ended June 30, 2015 and June 30, 2014, respectively, and approximately $16.3 million in each of the six month periods ended June 30, 2015 and June 30, 2014. As of June 30, 2015, there was approximately $37.3 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 those costs over a weighted average period of 1.49 years.

During the six months ended June 30, 2015, the Company issued a total of 1,208,054 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 (ESPP). During the six months ended June 30, 2014, the Company issued a total of 725,612 shares of its common stock upon the exercise of stock options, pursuant to restricted stock grants and pursuant to purchases under the ESPP. Cash received from the exercise of stock options and purchases through the ESPP during the six months ended June 30, 2015 and June 30, 2014 was $20.8 million and $9.5 million, respectively, and is included within the financing activities section of the consolidated statements of cash flows.