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		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share, Basic [Abstract]
Net income	$ 5,431	$ 3,286	$ 15,372	$ 9,200
Weighted average shares outstanding - basic (shares)	26,721	26,600	26,598	26,535
Basic EPS (US$ per share)	$ 0.20	$ 0.12	$ 0.58	$ 0.35
Earnings Per Share, Diluted [Abstract]
Dilutive stock options	76	115	81	131
Dilutive nonvested deferred shares	451	441	550	488
Diluted weighted average shares (shares)	27,248	27,156	27,229	27,154
Diluted EPS (US$ per share)	$ 0.20	$ 0.12	$ 0.56	$ 0.34