Employee Benefit Plans - Defined Contribution Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items]
Company's percent match on 401(k) defined contribution plan	70.00%	70.00%	70.00%
Maximum percentage of employee contribution matched by the Company	6.00%	6.00%	6.00%
Minimum age to be eligible for 401(k) plan	18 years
Number of minimum hours required to work for 401(k) plan eligibility	1 hour
Employer's matching contribution, annual vesting percentage for 401(k) plan	25.00%
Number of years to be fully vested for 401(k) plan	4 years
401(k) plan match
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, expense	$ 1,600	$ 1,500	$ 1,300
Supplemental Employee Retirement Plan
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, expense	$ 249	$ 322