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Summary of Significant Accounting Policies and New Accounting Standards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Accounting Policies [Abstract]
Net income	$ 15,892	$ 12,177
Weighted average number of shares - basic (in shares)	39,944	39,408
Dilutive effect of stock options	349	498
Weighted average number of shares - diluted (in shares)	40,293	39,906
Net income per share
basic (in dollars per share)	$ 0.40	$ 0.31
diluted (in dollars per share)	$ 0.39	$ 0.31

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