Stock-Based Compensation, Phantom Stock Option Plan and Long-term Incentive Plan (Details) - 2011 Phantom Stock Option and Long-term Incentive Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016
Stock option related information [Abstract]
Total liability for long-term incentive plan	$ 1,200		$ 1,200		$ 1,400
Phantom Stock Option [Member]
Stock option activity, shares [Roll Forward]
Outstanding at beginning of year (in shares)			1,353,554	1,257,508
Options granted (in shares)			578,200	493,760
Options paid in cash upon vesting (in shares)			(408,034)	(396,714)
Outstanding at period end (in shares)	1,523,720	1,354,554	1,523,720	1,354,554
Stock option related information [Abstract]
Cash paid out on options vested	$ 845	$ 0	$ 845	$ 711
Compensation costs recognized	$ 347	$ 240	$ 588	$ 420