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Benefit Plans - Components of Net Periodic Pension Income (Details) - Pension plans contribution [Member] - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Net periodic pension income    
Service cost $ 733 $ 1,163
Interest cost 7,809 9,485
Expected return on plan assets (14,757) (14,709)
Amortization of transition obligation 23 21
Amortization of prior service credit (113) (104)
Recognition of actuarial losses 2,112 1,833
Special Termination Benefits Charge 0 54
Net periodic pension income $ (4,193) $ (2,257)