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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		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Summary of Significant Accounting Policies and New Accounting Standards
Net income	$ 13,501	$ 14,849	$ 27,910	$ 45,911
Weighted average number of shares - basic (in shares)	40,454	40,442	40,454	40,398
Dilutive effect of stock options and restricted stock units	50	89	50	121
Weighted average number of shares - diluted (in shares)	40,504	40,531	40,504	40,519
Net income per share
basic (in dollars per share)	$ 0.33	$ 0.37	$ 0.69	$ 1.14
diluted (in dollars per share)	$ 0.33	$ 0.37	$ 0.69	$ 1.13

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