Employee Benefit Plans (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1,093	$ 1,068
Expected return on plan assets	(1,432)	(1,824)
Pension settlement	0	0
Amortization of prior service credits	(53)	(28)
Net benefit (credit) cost	(392)	(784)
Other postretirement benefits plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	71	85
Interest cost	501	528
Amortization of other actuarial losses (gains)	(627)	0
Net benefit (credit) cost	$ (55)	$ 613