Employee Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Net periodic benefit cost
Service cost	$ 3,287	$ 3,817	$ 4,481
Interest cost	9,913	10,106	7,730
Expected return on plan assets	(14,541)	(15,025)	(18,891)
Amortization of prior service cost	(2,896)	(3,280)	(3,280)
Effect of partial curtailment	(506)	(2,666)	0
Amortization of net loss	0	207	777
Net periodic benefit cost	(4,743)	(6,841)	(9,183)
Post-retirement Benefits
Net periodic benefit cost
Service cost	0	0	0
Interest cost	0	0	2
Expected return on plan assets	0	0	0
Amortization of prior service cost	0	0	(15,085)
Effect of partial curtailment	0	0	(26)
Amortization of net loss	0	0	2,824
Net periodic benefit cost	$ 0	$ 0	$ (12,285)