Employee Benefit Plans (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7,796	$ 7,564	$ 6,677
Interest cost	4,439	5,115	4,922
Amortization of other actuarial losses (gains)	(2,363)	(1,189)	0
Defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	4,334	5,498	8,141
Curtailments	0	0	0
Settlements	(1,768)	(896)	(1,326)
Expected return on plan assets	(7,245)	(8,283)	(10,555)
Amortization of prior service credits	(190)	(112)	(24)
Amortization of other actuarial losses (gains)	0	0	(11)
Net benefit cost (credit)	(4,869)	(3,793)	(3,775)
Other postretirement benefits plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	341	419	480
Interest cost	2,113	2,392	3,505
Curtailments	0	0	0
Settlements	0	0	0
Expected return on plan assets	0	0	0
Amortization of prior service credits	0	0	0
Amortization of other actuarial losses (gains)	0	(1,379)	(2,974)
Net benefit cost (credit)	$ 2,454	$ 1,432	$ 1,011