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Benefit Plans - Components of Net Periodic Other Postretirement Benefit Cost (Details) - Other postretirement benefit plans [Member] - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Net periodic other postretirement benefit costs    
Interest cost $ 168 $ 210
Amortization of prior service credit (6) (6)
Recognition of actuarial loss (gains) 89 81
Net periodic other postretirement benefit cost $ 251 $ 285