Employee Benefit Plans - Components of Net Periodic Postretirement Benefit Cost (Details) - Other postretirement benefits - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost, benefits attributed for service of active employees for the period	$ 104	$ 103	$ 103
Interest cost on the accumulated postretirement benefit obligation	99	154	210
Amortization of actuarial gain		(22)	(117)
Net periodic postretirement benefit cost	$ 203	$ 235	$ 196