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Pension and Other Postretirement Benefits - Amounts Related to Other Postretirement Benefit Plans Recognized in Accumulated Other Comprehensive (Loss) Income (Details) - Other postretirement benefit plans [Member] - USD ($)
$ in Thousands
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]    
Unrecognized Net Actuarial Losses $ 6,368 $ 5,969
Unrecognized Net Prior Service Credits (150) (172)
Total $ 6,218 $ 5,797