Retirement Agreements and Other Postretirement Benefit Plan (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) h	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
DefinedContributionPlanMinimumNumberOfMonthsEmployedEligibility	3 months
Minimum number of years employed in order to participate in the 401(k) plan	1 year
Minimum number of hours worked annually in order to participate in the 401(k) plan | h	1,000
Defined contribution plan contribution percent	3.00%
Expenses related to the 401(k) plan	$ 1,800	$ 1,200
Amount accrued for all deferred compensation plan agreements	12,500	12,200
Amount recognized in accumulated other comprehensive income, before tax	(184)	(82)	$ (41)
Amount recognized in accumulated other comprehensive income, net of tax	(144)	$ (32)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2021	15
2022	23
2023	31
2024	28
2025	34
Next 5 years thereafter	$ 217
Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncompete period following employment	2 years