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Pension And Other Postretirement Benefit Plans (Components Of Company's Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1,361 $ 1,483
Interest cost 2,469 2,346
Expected return on plan assets (3,589) (3,576)
Net amortization and deferral 838 1,199
Net periodic benefit cost 1,079 1,452
Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 73 108
Interest cost 375 407
Expected return on plan assets (11) (15)
Net amortization and deferral (100) (44)
Net periodic benefit cost $ 337 $ 456