Equity Compensation (Fair Value) (Details) - USD ($)
$ / shares in Units, $ in Thousands |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Stock options |
|
|
|
| Total fair value for the awards vested during the period |
$ 8,000
|
|
|
| Weighted Average Grant Date Fair Value |
|
|
|
| Aggregate intrinsic value of unvested restricted stock |
$ 3,100
|
|
|
| Common stock price (in dollars per share) |
$ 7.27
|
|
|
| Stock options |
|
|
|
| Intrinsic-value |
|
|
|
| Options Exercised |
$ 1,432
|
$ 22,668
|
$ 1,315
|
| Options Exercisable |
3,496
|
22,718
|
42,116
|
| Options Vested and Expected to Vest |
$ 3,499
|
$ 27,663
|
$ 55,099
|
| Assumptions used to estimate fair value of stock options |
|
|
|
| Expected volatility, minimum (as a percent) |
51.00%
|
49.00%
|
56.00%
|
| Expected volatility, maximum (as a percent) |
55.00%
|
60.00%
|
59.00%
|
| Expected dividends (as a percent) |
0.00%
|
0.00%
|
0.00%
|
| Risk-free rate, minimum (as a percent) |
1.30%
|
0.30%
|
0.80%
|
| Risk-free rate, maximum (as a percent) |
1.80%
|
2.00%
|
1.70%
|
| Stock options | Minimum |
|
|
|
| Assumptions used to estimate fair value of stock options |
|
|
|
| Expected term |
5 years 3 months 18 days
|
1 year
|
3 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
|
7 years 2 months 12 days
|
| Restricted stock units |
|
|
|
| Restricted stock units |
|
|
|
| Awarded |
433,000
|
|
|
| Forfeited |
(8,000)
|
|
|
| Non-vested balance at end of period (in shares) |
425,000
|
|
|
| Weighted Average Grant Date Fair Value |
|
|
|
| Awarded (in dollars per share) |
$ 8.18
|
|
|