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Pension and Other Postretirement Benefits - Amounts Related to Defined Pension Plans Recognized in Accumulated Other Comprehensive (Loss) Income (Details) - Pension plans contribution [Member] - USD ($)
$ in Thousands
Jun. 30, 2015
Jun. 30, 2014
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]    
Unrecognized Net Actuarial Losses $ 196,567 $ 121,799
Unrecognized Net Prior Service Credits (953) (939)
Unrecognized Transition Obligations 951 1,105
Total $ 196,565 $ 121,965