Benefit Plans - 401(k) Plan (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Benefit Plans
401(k) Plan Matching contributions by the Company as percentage of employees' contributions	50.00%
401(k) Plan Maximum contributions by the Company as percentage of employees' gross pay	8.00%
401(k) Plan contributions	$ 1,394	$ 1,111