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Postretirement Benefits (Components Of Net Periodic Benefit Cost) (Details) (Postretirement Benefits [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Postretirement Benefits [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 8 $ 6
Interest cost 28 37
Amortization of unrecognized net gain (5) (8)
Amortization of prior service asset (1) (1)
Net periodic benefit (income) cost $ 30 $ 34