Summary of Significant Accounting Policies and New Accounting Standards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Accounting Policies [Abstract]
Net income (loss)	$ 82,728	$ 60,280	$ (3,127)
Weighted average number of shares - basic	39,254	38,969	32,193
Dilutive effect of stock options and warrant	708	846
Weighted average number of shares - diluted	39,962	39,815	32,193
Net income per share:
basic (in dollars per share)	$ 2.11	$ 1.55	$ (0.10)
diluted (in dollars per share)	$ 2.07	$ 1.51	$ (0.10)