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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 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Net periodic other postretirement benefit costs        
Service cost $ 0 $ 27 $ 0 $ 54
Interest cost 210 259 420 519
Amortization of prior service credit (5) (28) (11) (55)
Recognition of actuarial loss (gains) 81 207 162 414
Curtailment Gain 0 (221) 0 (221)
Net periodic other postretirement benefit cost $ 286 $ 244 $ 571 $ 711