Pension and Other Postretirement Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 104	$ 180
Interest cost	2,455	1,360
Expected return on plan assets	(1,997)	(2,084)
Actuarial loss (gain) amortization	101	257
Prior service cost (income) amortization	8	2
Net periodic benefit (income) cost	671	(285)
Other Postretirement Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0	(8)
Interest cost	19	9
Expected return on plan assets	0	0
Actuarial loss (gain) amortization	(30)	(24)
Prior service cost (income) amortization	(4)	1
Net periodic benefit (income) cost	$ (15)	$ (22)