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Pension and Other Postretirement Benefits - Components of Net Periodic Pension Income (Details) - Pension plans contribution [Member] - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Net periodic pension income    
Service cost $ 411 $ 404
Interest cost 7,990 7,657
Expected return on plan assets (13,462) (14,090)
Amortization of transition obligation 23 23
Amortization of prior service (credit) cost (5) 173
Recognition of actuarial losses 1,695 1,710
Net periodic pension income $ (3,348) $ (4,123)