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Earnings per Common Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic [Abstract]
Net income (loss)	$ 6,151	$ 2,305
Weighted average shares outstanding - basic (shares)	26,935	26,921
Basic EPS (US$ per share)	$ 0.23	$ 0.09
Earnings Per Share, Diluted [Abstract]
Dilutive stock options	25	31
Dilutive nonvested deferred shares	615	637
Diluted weighted average shares (shares)	27,575	27,589
Diluted EPS (US$ per share)	$ 0.22	$ 0.08

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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