Equity Compensation (Fair Value) (Details) - USD ($)
$ in Thousands |
3 Months Ended |
6 Months Ended |
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
| Stock options |
|
|
|
|
| Total fair value for the awards vested during the period |
$ 1,300
|
|
$ 4,300
|
|
| Assumptions used to estimate fair value of stock options |
|
|
|
|
| Expected volatility, minimum (as a percent) |
53.00%
|
59.00%
|
|
|
| Stock options |
|
|
|
|
| Intrinsic-value |
|
|
|
|
| Options Exercised |
|
|
1,039
|
$ 16,907
|
| Options Exercisable |
$ 6,991
|
$ 37,576
|
6,991
|
37,576
|
| Options Vested and Expected to Vest |
$ 7,266
|
$ 49,142
|
$ 7,266
|
$ 49,142
|
| Assumptions used to estimate fair value of stock options |
|
|
|
|
| Expected volatility, minimum (as a percent) |
|
|
53.00%
|
56.00%
|
| Expected volatility, maximum (as a percent) |
53.00%
|
59.00%
|
55.00%
|
60.00%
|
| Risk-free rate, minimum (as a percent) |
1.50%
|
1.70%
|
1.30%
|
1.10%
|
| Risk-free rate, maximum (as a percent) |
1.80%
|
1.90%
|
1.80%
|
2.00%
|
| Stock options | Minimum |
|
|
|
|
| Assumptions used to estimate fair value of stock options |
|
|
|
|
| Expected term |
5 years 3 months 18 days
|
6 years
|
5 years 3 months 18 days
|
3 years 9 months 18 days
|
| Stock options | Maximum |
|
|
|
|
| Assumptions used to estimate fair value of stock options |
|
|
|
|
| Expected term |
6 years 1 month 6 days
|
6 years 1 month 6 days
|
6 years 1 month 6 days
|
6 years 1 month 6 days
|