Employee Benefit Plans (Consolidated Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Components of net periodic pension and postretirement benefit expense:
Service cost	$ 27,200	$ 28,200	$ 27,700
Interest cost	10,700	9,500	11,000
Expected return on plan assets	(12,800)	(11,900)	(11,400)
Amortization of prior service credit	(200)	(200)	(200)
Amortization of actuarial loss	4,200	5,400	5,400
Settlement cost	9,500	2,600	1,000
Settlement gain on disposition of assets	0	0	(1,300)
Net periodic benefit cost	38,600	33,600	32,200
Other Postretirement Benefits
Components of net periodic pension and postretirement benefit expense:
Service cost	300	300	300
Interest cost	400	400	500
Expected return on plan assets	0	0	0
Amortization of prior service credit	0	0	0
Amortization of actuarial loss	400	600	400
Settlement cost	0	0	0
Settlement gain on disposition of assets	0	0	0
Net periodic benefit cost	$ 1,100	$ 1,300	$ 1,200