Equity Compensation (401(k) Plan) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Defined Contribution Plan Disclosure [Line Items]
Maximum amount of employees' gross pay the employee may contribute (as a percent)		3.50%
Shares contributed (in shares)	30,482
Expenses associated with contribution		$ 1.1
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%