Equity Compensation (401(k) Plan) (Details)
$ in Millions |
6 Months Ended |
|
Jun. 30, 2018
USD ($)
|
|---|
| Defined Contribution Plan Disclosure [Line Items] |
|
| Maximum amount of employees' gross pay the employee may contribute (as a percent) |
3.50%
|
| Expenses associated with contribution |
$ 0.8
|
| First 1% of employees' salary |
|
| Defined Contribution Plan Disclosure [Line Items] |
|
| Employer matching contribution (as a percent) |
100.00%
|
| Employees' gross pay for which the employer contributes a matching contribution (as a percent) |
1.00%
|
| Second 5% of employees' salary |
|
| Defined Contribution Plan Disclosure [Line Items] |
|
| Employer matching contribution (as a percent) |
50.00%
|
| Employees' gross pay for which the employer contributes a matching contribution (as a percent) |
5.00%
|