Stock-Based Compensation	6 Months Ended
Stock-Based Compensation	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Share-Based Compensation The Company recorded approximately $8.9 million and $16.3 million of share-based compensation expense for the three and six months ended June 30, 2014, respectively. The Company recorded approximately $5.8 million and $10.5 million of share-based compensation expense for the three and six months ended June 30, 2013, respectively. As of June 30, 2014, there was approximately $38.9 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 1.43 years. 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 Company's 2010 employee stock purchase plan (ESPP). During the six months ended June 30, 2013, the Company issued a total of 2,644,622 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, 2014 and June 30, 2013 was $9.5 million and $49.6 million, respectively, and is included within the financing activities section of the consolidated statements of cash flows.

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.

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