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Net Periodic Benefit Cost (Components of net periodic pension cost and net periodic postretirement benefit cost) (Details) - Pension Plans, Defined Benefiit - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]    
Service costs $ 180 $ 254
Interest cost 2,870 2,576
Expected return on plan assets (2,713) (3,261)
Net amortization 208 370
Net periodic pension (benefit) cost $ 545 $ (61)