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Employee Benefit Plans - Net periodic pension expense (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]      
Service cost-benefits earned during the year $ 845 $ 2,939 $ 2,954
Interest cost on benefit obligation 2,045 2,893 2,618
Expected return on plan assets (3,389) (3,177) (2,828)
Amortization of net actuarial loss and prior service costs 672 1,784 1,405
Curtailment expense 16
Settlement expense 1,702
Net pension expense $ 1,891 $ 4,439 $ 4,149