Pensions and Other Postretirement Plans (Obligation, Asset, and Funding Information) (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service cost	$ 32,567	$ 22,991	$ 22,656
Pension Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at begining of year	1,088,309	1,095,117
Service cost	32,567	22,991	22,656
Interest cost	30,504	26,917	32,587
Amendments	0	2
Actuarial (gain) loss	(219,466)	5,660
Benefits paid	(65,240)	(63,510)
Special termination benefits	3,624	1,132
Benefit obligation at end of year	870,298	1,088,309	1,095,117
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of assets at beginning of year	3,394,823	2,803,422
Actual return on plan assets	(801,239)	654,911
Benefits paid	(65,240)	(63,510)
Fair value of assets at end of year	2,528,344	3,394,823	2,803,422
Funded status	1,658,046	2,306,514
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at begining of year	112,706	122,299
Service cost	911	1,022	954
Interest cost	3,289	2,943	3,678
Actuarial (gain) loss	(20,956)	(7,640)
Benefits paid	(5,932)	(5,918)
Benefit obligation at end of year	90,018	112,706	122,299
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Benefits paid	(5,900)	(5,900)
Funded status	(90,018)	(112,706)
Other Postretirement Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at begining of year	4,722	5,587
Interest cost	98	92	167
Actuarial (gain) loss	(1,205)	(582)
Benefits paid, net of Medicare subsidy	(215)	(375)
Benefit obligation at end of year	3,400	4,722	$ 5,587
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Benefits paid	(200)	(400)
Funded status	$ (3,400)	$ (4,722)