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Pension And Other Postretirement Benefit Plans (Components Of Company's Net Periodic Benefit Cost) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Pension Benefits [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1,334 $ 1,195
Interest cost 2,669 2,857
Expected return on plan assets (3,692) (3,542)
Net amortization and deferral 780 2,447
Net periodic benefit cost 1,091 2,957
Other Postretirement Benefits [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 114 138
Interest cost 484 532
Expected return on plan assets (26) (30)
Net amortization and deferral (133) (17)
Net periodic benefit cost $ 439 $ 623