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Summary of Significant Accounting Policies and New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Net income	$ 19,840	$ 23,643	$ 42,764	$ 49,237
Weighted average number of shares - basic (in shares)	40,254	39,512	40,127	39,443
Dilutive effect of stock options	136	547	221	545
Weighted average number of shares - diluted (in shares)	40,390	40,059	40,348	39,988
Net income per share
basic (in dollars per share)	$ 0.49	$ 0.60	$ 1.07	$ 1.25
diluted (in dollars per share)	$ 0.49	$ 0.59	$ 1.06	$ 1.23

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