Equity Compensation (Fair Value) (Details) - USD ($)
$ in Thousands |
3 Months Ended |
9 Months Ended |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
| Stock options |
|
|
|
|
| Total fair value for the awards vested during the period |
$ 1,300
|
|
$ 4,200
|
|
| Stock options |
|
|
|
|
| Stock options |
|
|
|
|
| Stock options granted (in shares) |
0
|
|
50,000
|
|
| Intrinsic-value |
|
|
|
|
| Options Exercised |
|
|
$ 2,978
|
$ 1,327
|
| Options Exercisable |
$ 10,491
|
$ 5,333
|
10,491
|
5,333
|
| Options Vested and Expected to Vest |
$ 11,065
|
$ 5,389
|
$ 11,065
|
$ 5,389
|
| Assumptions used to estimate fair value of stock options |
|
|
|
|
| Expected volatility, minimum (as a percent) |
|
|
|
53.00%
|
| Expected volatility, maximum (as a percent) |
|
|
|
55.00%
|
| Expected volatility (as a percent) |
|
53.00%
|
62.00%
|
|
| Expected dividends (as a percent) |
|
0.00%
|
0.00%
|
0.00%
|
| Expected term |
|
|
6 years 1 month 6 days
|
|
| Risk-free rate (as a percent) |
|
|
1.10%
|
|
| Risk-free rate, minimum (as a percent) |
|
1.50%
|
|
1.30%
|
| Risk-free rate, maximum (as a percent) |
|
1.80%
|
|
1.80%
|
| 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
|
| 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
|