Stock-Based Compensation Expense	3 Months Ended
Stock-Based Compensation Expense	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Expense	Stock-Based Compensation Expense On February 16, 2012, the Company granted 161,724 shares of time-vesting restricted Class A common stock, with an aggregate grant date fair value of $0.6 million, to the non-employee directors of the Company with a cliff vesting term of one year. In addition, on February 16, 2012, the Company granted time-vesting stock options to purchase 1.4 million shares of Class A common stock to certain Company employees, with an aggregate grant date fair value of $3.3 million. The options have an exercise price of $4.34 per share, with 30% of the awards having vested on each of September 16, 2012 and February 16, 2013, and 20% having vested on each of February 16, 2014 and February 16, 2015. On December 27, 2012, the Company issued stock options to an officer of the Company exercisable for 0.8 million shares of Class A common stock with an aggregate grant date fair value of $1.1 million. The options have an exercise price of $4.34 per share, and provide for vesting on each of the first four anniversaries of the date of grant, with 30% of the award having vested on each of the first two anniversaries thereof, and 20% of the award vesting on each of the next two anniversaries thereof. On May 22, 2014, the Company granted 93,312 shares of time-vesting restricted Class A common stock, with an aggregate grant fair value of $0.6 million, to the non-employee directors of the Company with a cliff vesting term of one year. During the three months ended March 31, 2015, the Company granted 250,000 stock options with an aggregate grant date fair value of $0.6 million. During the three months ended March 31, 2014, the Company granted 0.4 million stock options with an aggregate grant date fair value of $1.7 million. The options range in exercise price from $2.91 to $7.74 per share, and provide for vesting on each of the first four anniversaries of the date of grant, with 30% of the award vesting on each of the first two anniversaries thereof, and 20% of the award vesting on each of the next two anniversaries thereof. For the three months ended March 31, 2015, and 2014, the Company recognized approximately $3.9 million and $4.1 million, respectively, in stock-based compensation expense related to equity awards. As of March 31, 2015, unrecognized stock-based compensation expense of approximately $22.2 million related to equity awards is expected to be recognized over a weighted average remaining life of 2.47 years. Unrecognized stock-based compensation expense for equity awards will be adjusted for future changes in estimated forfeitures. The total fair value of restricted stock awards that vested during the three months ended March 31, 2015 and March 31, 2014 was $0.1 million and $1.0 million, respectively. There were no stock options exercised during the three months ended March 31, 2015 and 1.1 million stock options were exercised during the three months ended March 31, 2014.

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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