Equity Compensation (Fair Value) (Details) - USD ($)
$ / shares in Units, $ in Thousands |
3 Months Ended |
9 Months Ended |
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
| Stock options |
|
|
|
|
| Total fair value for the awards vested during the period |
$ 1,700
|
|
$ 6,000
|
|
| Stock options |
|
|
|
|
| Intrinsic-value |
|
|
|
|
| Options Exercised |
|
|
1,327
|
$ 17,856
|
| Options Exercisable |
5,333
|
$ 19,883
|
5,333
|
19,883
|
| Options Vested and Expected to Vest |
$ 5,389
|
$ 23,644
|
$ 5,389
|
$ 23,644
|
| Assumptions used to estimate fair value of stock options |
|
|
|
|
| Expected volatility, minimum (as a percent) |
|
57.00%
|
53.00%
|
56.00%
|
| Expected volatility, maximum (as a percent) |
|
58.00%
|
55.00%
|
60.00%
|
| Expected volatility (as a percent) |
53.00%
|
|
|
|
| Expected term |
|
6 years 1 month 6 days
|
|
|
| Risk-free rate, minimum (as a percent) |
1.50%
|
1.80%
|
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
|
|
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
|
| Restricted stock units |
|
|
|
|
| Restricted stock units |
|
|
|
|
| Awarded |
|
|
388,000
|
|
| Vested |
0
|
|
0
|
|
| Non-vested balance at end of period (in shares) |
388,000
|
|
388,000
|
|
| Weighted Average Grant Date Fair Value |
|
|
|
|
| Awarded (in dollars per share) |
|
|
$ 8.30
|
|