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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]    
Net Income $ 33,400 $ 27,628
Defined Benefit Pension and Postretirement Benefit Plans:    
Amortization of loss, before tax 170 131
Amortization of prior service credit, before tax (45) (1)
Total Other Comprehensive Income, Before Tax 125 130
Tax Attributes of Items in Other Comprehensive Income:    
Amortization of loss, tax (63) (49)
Amortization of prior service credit, tax 16 0
Total Tax Expense (47) (49)
Other Comprehensive Income, Net of Tax 78 81
Comprehensive Income $ 33,478 $ 27,709