Benefit Plans - Components of Net Periodic Pension Income (Details) - Pension plans contribution [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Net periodic pension income
Service cost	$ 727	$ 1,156	$ 1,460	$ 2,319
Interest cost	7,770	9,438	15,579	18,923
Expected return on plan assets	(14,672)	(14,657)	(29,429)	(29,364)
Amortization of transition obligation	22	21	45	42
Amortization of prior service credit	(113)	(104)	(226)	(209)
Recognition of actuarial losses	2,088	1,815	4,200	3,648
Special Termination Benefits Charge	0	54	0	107
Net periodic pension income	$ (4,178)	$ (2,277)	$ (8,371)	$ (4,534)