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Employee Benefit Plans - Net periodic pension expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]    
Service cost - benefits earned during the period $ 719 $ 821
Interest cost on benefit obligation 689 734
Expected return on plan assets (742) (766)
Amortization of net actuarial loss and prior service costs 384 286
Net periodic pension expense $ 1,050 $ 1,075