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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, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Accounting Policies [Abstract]
Net income	$ 14,849	$ 19,840	$ 45,911	$ 42,764
Weighted average number of shares - basic (in shares)	40,442	40,254	40,398	40,127
Dilutive effect of stock options and restricted stock units	89	136	121	221
Weighted average number of shares - diluted (in shares)	40,531	40,390	40,519	40,348
Net income per share
basic (in dollars per share)	$ 0.37	$ 0.49	$ 1.14	$ 1.07
diluted (in dollars per share)	$ 0.37	$ 0.49	$ 1.13	$ 1.06

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