|
Stock-based Compensation (Details) (Equity Incentive Plan, USD $)
In Millions, except Share data, unless otherwise specified
|
3 Months Ended |
|
Mar. 31, 2015
|
Mar. 31, 2014
|
| Compensation expense |
|
|
| Recorded compensation costs for the RSAs and RSUs |
$ 0.6 |
$ 0.5 |
|
Restricted Stock Awards (RSAs)
|
|
|
| Stock-based Compensation |
|
|
| Awards granted (in shares) |
59,151 |
58,378 |
| Awards cancelled (in shares) |
5,193 |
|
| Weighted average grant date fair value (in dollars per share) |
$ 24.30 |
$ 23.61 |
|
Restricted Stock Awards (RSAs) | Employees
|
|
|
| Stock-based Compensation |
|
|
| Vesting period |
36 months |
36 months |
|
Restricted Stock Awards (RSAs) | Director
|
|
|
| Stock-based Compensation |
|
|
| Vesting period |
12 months |
|
|
Restricted Stock Unit Award (RSUs) | Officer
|
|
|
| Stock-based Compensation |
|
|
| Awards granted (in shares) |
37,137 |
37,143 |
| Expiration period of award |
3 years |
3 years |
| Weighted average grant date fair value (in dollars per share) |
$ 24.30 |
$ 23.61 |
|
Restricted Stock Unit Award (RSUs) | Officer | Minimum
|
|
|
| Stock-based Compensation |
|
|
| Options vested on anniversary date (as a percent) |
0.00% |
|
|
Restricted Stock Unit Award (RSUs) | Officer | Maximum
|
|
|
| Stock-based Compensation |
|
|
| Options vested on anniversary date (as a percent) |
200.00% |
|