Employee Benefit Plans (Schedule of Defined Benefit Plans Disclosures) (Details) - 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	$ 5,991	$ 7,796	$ 7,564
Interest cost	4,610	4,439	5,115
Defined benefit pension plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligations at beginning of year	169,976	202,267
Service cost	0	0	0
Interest cost	5,264	4,334	5,498
Settlement gain	(771)	(1,768)
Plan Amendments	0	(341)
Benefits paid	(22,164)	(27,014)
Other-primarily actuarial (gain) loss	(29,875)	(7,502)
Benefit Obligations at end of year	122,430	169,976	202,267
CHANGE IN PLAN ASSETS
Value of Plan Assets at beginning of year	177,499	199,248
Actual return on plan assets	(34,325)	5,117
Employer contributions	117	148
Benefits paid	(22,164)	(27,014)
Value of Plan Assets at end of year	121,127	177,499	199,248
Accrued benefit net asset (obiligation)	(1,303)	7,523
ITEMS NOT YET RECOGNIZED AS A COMPONENT OF NET PERIODIC BENEFIT COST
Prior service credit	945	1,091
Accumulated gain	5,164	16,102
Total not yet recognized as a component of net periodic benefit cost	6,109	17,193
BALANCE SHEET AMOUNTS
Noncurrent asset	0	8,973
Current liability	(202)	(150)
Noncurrent liability	(1,101)	(1,300)
Total balance sheet amounts	(1,303)	7,523
Other postretirement benefits plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligations at beginning of year	79,245	100,898
Service cost	282	341	419
Interest cost	2,006	2,113	2,392
Settlement gain	0	0
Plan Amendments	0	0
Benefits paid	(4,834)	(5,676)
Other-primarily actuarial (gain) loss	(22,185)	(18,431)
Benefit Obligations at end of year	54,514	79,245	100,898
CHANGE IN PLAN ASSETS
Value of Plan Assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	4,834	5,676
Benefits paid	(4,834)	(5,676)
Value of Plan Assets at end of year	0	0	$ 0
Accrued benefit net asset (obiligation)	(54,514)	(79,245)
ITEMS NOT YET RECOGNIZED AS A COMPONENT OF NET PERIODIC BENEFIT COST
Prior service credit	0	0
Accumulated gain	40,334	20,657
Total not yet recognized as a component of net periodic benefit cost	40,334	20,657
BALANCE SHEET AMOUNTS
Noncurrent asset	0	0
Current liability	(4,840)	(5,680)
Noncurrent liability	(49,674)	(73,565)
Total balance sheet amounts	$ (54,514)	$ (79,245)