Employee Benefit Plans (Schedule of Defined Benefit Plans Disclosures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service cost	$ 7,796	$ 7,564	$ 6,677
Interest cost	4,439	5,115	4,922
Defined benefit pension plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligations at beginning of year	202,267	217,548
Service cost	0	0	0
Interest cost	4,334	5,498	8,141
Settlement gain	(1,768)	(896)
Curtailments	0	0
Plan Amendments	(341)	0
Benefits paid	(27,014)	(38,221)
Other-primarily actuarial (gain) loss	(7,502)	18,338
Benefit Obligations at end of year	169,976	202,267	217,548
CHANGE IN PLAN ASSETS
Value of Plan Assets at beginning of year	199,248	211,802
Actual return on plan assets	5,117	23,055
Employer contributions	148	2,612
Benefits paid	(27,014)	(38,221)
Value of Plan Assets at end of year	177,499	199,248	211,802
Accrued benefit net asset (obiligation)	7,523	(3,019)
ITEMS NOT YET RECOGNIZED AS A COMPONENT OF NET PERIODIC BENEFIT COST
Prior service credit	1,091	880
Accumulated gain	16,102	10,790
Total not yet recognized as a component of net periodic benefit cost	17,193	11,670
BALANCE SHEET AMOUNTS
Noncurrent asset	8,973	0
Current liability	(150)	(140)
Noncurrent liability	(1,300)	(2,879)
Total balance sheet amounts	7,523	(3,019)
Other postretirement benefits plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligations at beginning of year	100,898	87,867
Service cost	341	419	480
Interest cost	2,113	2,392	3,505
Settlement gain	0	0
Curtailments	0	284
Plan Amendments	0	0
Benefits paid	(5,676)	(6,507)
Other-primarily actuarial (gain) loss	(18,431)	16,443
Benefit Obligations at end of year	79,245	100,898	87,867
CHANGE IN PLAN ASSETS
Value of Plan Assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	5,676	6,507
Benefits paid	(5,676)	(6,507)
Value of Plan Assets at end of year	0	0	$ 0
Accrued benefit net asset (obiligation)	(79,245)	(100,898)
ITEMS NOT YET RECOGNIZED AS A COMPONENT OF NET PERIODIC BENEFIT COST
Prior service credit	0	0
Accumulated gain	20,657	2,226
Total not yet recognized as a component of net periodic benefit cost	20,657	2,226
BALANCE SHEET AMOUNTS
Noncurrent asset	0	0
Current liability	(5,680)	(6,510)
Noncurrent liability	(73,565)	(94,388)
Total balance sheet amounts	$ (79,245)	$ (100,898)