|
Equity Compensation (Details 3) (USD $)
|
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Stock options | ||
| Total fair value for the awards vested during the period | $ 2,900,000 | |
| Stock options | ||
| Intrinsic-value | ||
| Options Exercised | 782,000 | |
| Options Exercisable | 14,232,000 | |
| Options Vested and Expected to Vest | $ 15,915,000 | |
| Assumptions used to estimate fair value of stock options | ||
| Expected dividends (as a percent) | 0.00% | 0.00% |
| Stock options | Minimum | ||
| Assumptions used to estimate fair value of stock options | ||
| Expected volatility (as a percent) | 54.00% | 56.00% |
| Expected term | 3 years 9 months 18 days | |
| Risk-free rate (as a percent) | 1.30% | 1.10% |
| Stock options | Maximum | ||
| Assumptions used to estimate fair value of stock options | ||
| Expected volatility (as a percent) | 55.00% | 60.00% |
| Expected term | 6 years 1 month 6 days | 6 years 1 month 6 days |
| Risk-free rate (as a percent) | 1.60% | 2.00% |