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Summary of Significant Accounting Policies and New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Accounting Policies [Abstract]
Net income	$ 12,177	$ 18,753
Weighted average number of shares - basic	39,408	39,092
Dilutive effect of stock options	498	920
Weighted average number of shares - diluted	39,906	40,012
Net income per share
basic (in dollars per share)	$ 0.31	$ 0.48
diluted (in dollars per share)	$ 0.31	$ 0.47

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