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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, 2018	Sep. 30, 2017
Accounting Policies [Abstract]
Net income	$ 16,314	$ 15,892
Weighted average number of shares - basic (in shares)	40,369	39,944
Dilutive effect of stock options and restricted stock units	191	349
Weighted average number of shares - diluted (in shares)	40,560	40,293
Net income per share
basic (in dollars per share)	$ 0.40	$ 0.40
diluted (in dollars per share)	$ 0.40	$ 0.39

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