Summary of Significant Accounting Policies and New Accounting Standards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Net income (in dollars)	$ 30,178	$ 14,248	$ 48,931	$ 33,180
Weighted average number of shares - basic	39,163	38,957	39,128	38,928
Dilutive effect of stock options and warrant	815	856	867	762
Weighted average number of shares - diluted	39,978	39,813	39,995	39,690
Net income per share:
basic (in dollars per share)	$ 0.77	$ 0.37	$ 1.25	$ 0.85
diluted (in dollars per share)	$ 0.75	$ 0.36	$ 1.22	$ 0.84