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Employee Benefit Plans - Net periodic pension expense (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]      
Service cost-benefits earned during the year $ 0 $ 0 $ 845
Interest cost on benefit obligation 2,407 2,157 2,045
Expected return on plan assets (2,842) (3,236) (3,389)
Amortization of net actuarial loss 465 453 672
Curtailment expense 0 0 16
Settlement expense 0 0 1,702
Net periodic pension expense $ 30 $ (626) $ 1,891