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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		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Summary of Significant Accounting Policies and New Accounting Standards
Net income	$ 11,894	$ 14,748	$ 14,409	$ 31,062
Weighted average number of shares - basic (in shares)	40,454	40,383	40,454	40,376
Dilutive effect of stock options and restricted stock units	50	140	50	147
Weighted average number of shares - diluted (in shares)	40,504	40,523	40,504	40,523
Net income per share
basic (in dollars per share)	$ 0.29	$ 0.37	$ 0.36	$ 0.77
diluted (in dollars per share)	$ 0.29	$ 0.36	$ 0.36	$ 0.77

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