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Employee Benefit Plans - Net periodic pension expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]          
Service cost - benefits earned during the period     $ 735 $ 845 $ 2,204
Interest cost on benefit obligation $ 498   723 1,546 2,170
Expected return on plan assets (834)   (794) (2,540) (2,382)
Amortization of net actuarial (gain) loss and prior service costs 111   446 563 1,338
Settlement cost   $ 1,702   1,702  
Net periodic pension expense $ (225)   $ 1,110 $ 2,116 $ 3,330