Pension Plan and Employee Benefits - Schedule of Net Periodic Pension and Other Benefits Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pension Plan
Components of periodic benefit costs
Service cost	$ 966	$ 1,189
Interest cost	6,776	6,535
Expected return on plan assets	(8,292)	(7,607)
Amortizations
Net periodic benefit (income) cost	(550)	117
Other Benefits Plan
Components of periodic benefit costs
Service cost	395	479
Interest cost	586	583
Amortizations
Net gain (loss)	74	164
Net periodic benefit (income) cost	1,055	1,226
SERP Benefits
Components of periodic benefit costs
Service cost	14	34
Interest cost	864	836
Amortizations
Prior period service credit	(54)	(54)
Net gain (loss)	(35)	(21)
Net periodic benefit cost	$ 789	$ 795