Earnings per Common Share - Computation of Basic and Diluted Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share, Basic [Abstract]
Net income	$ 6,552	$ 4,684
Weighted average shares outstanding - basic (shares)	26,116	25,788
Basic EPS (US$ per share)	$ 0.25	$ 0.18
Earnings Per Share, Diluted [Abstract]
Dilutive stock options	137	70
Dilutive nonvested deferred shares	394	290
Diluted weighted average shares (shares)	26,647	26,148
Diluted EPS (US$ per share)	$ 0.25	$ 0.18