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Employee Benefit Plans - Net periodic pension expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]    
Service cost - benefits earned during the period $ 561 $ 719
Interest cost on benefit obligation 543 689
Expected return on plan assets (863) (742)
Amortization of net actuarial loss and prior service costs 347 384
Net periodic pension expense $ 588 $ 1,050