Retirement Plan (Details) - Supplemental Employee Retirement Plan - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent of employees' gross pay	100.00%
Defined contribution plan, maximum annual contributions per employee, percent	4.00%
Defined contribution plan, employer discretionary contribution amount	$ 2,200,000	$ 2,300,000
Defined contribution plan, employer discretionary profit sharing contribution amount	$ 0	$ 0