Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plans
Components of net periodic benefit cost:
Service cost	$ 3,491	$ 3,953	$ 3,930
Interest cost	9,248	7,512	9,729
Expected return on plan assets	(16,023)	(16,337)	(16,357)
Amortization of prior service cost	174	110	190
Settlement loss (gain)	1,189	(18)	3,153
Other adjustments	0	(191)	0
Net loss (gain) recognition	734	3,764	2,930
Net periodic benefit cost (income)	(1,187)	(1,207)	3,575
Other Plans
Components of net periodic benefit cost:
Service cost	24	33	33
Interest cost	761	727	809
Expected return on plan assets	0	0	0
Amortization of prior service cost	0	0	0
Settlement loss (gain)	0	0	0
Other adjustments	0	0	0
Net loss (gain) recognition	(73)	(43)	(59)
Net periodic benefit cost (income)	$ 712	$ 717	$ 783