Employee Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 01, 2020	Jul. 01, 2019
Employee Benefits
Employer contributions charged to expense	$ 2.1	$ 2.1	$ 1.8
Percentage of employer maximum total contributions	5.00%
Funded status of the plan (as a percent)				112.40%	92.50%
Percentage of employer's matching contribution of the employee's compensation	100.00%
Percentage of employee's compensation on which employer matches	3.00%
Percentage of employer's matching contribution of the employee's compensation	50.00%
Percentage of employee's compensation on which employer matches	2.00%
Employer contributions charged to expense	$ 1.7	$ 1.6	$ 1.4