Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,047	$ 1,293
Interest cost	3,077	2,540
Expected return on plan assets	(4,878)	(4,627)
Amortization of prior service cost	40	111
Recognized actuarial loss	2,247	2,785
Net periodic benefit cost (credit)	1,533	2,102
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	22	19
Amortization of prior service cost	(509)	(509)
Recognized actuarial loss	(25)	(2)
Net periodic benefit cost (credit)	$ (512)	$ (492)