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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		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share, Basic [Abstract]
Net income	$ 6,521	$ 4,862	$ 16,641	$ 15,402
Weighted average shares outstanding - basic (shares)	26,039	25,723	25,921	25,982
Basic EPS (US$ per share)	$ 0.25	$ 0.19	$ 0.64	$ 0.59
Earnings Per Share, Diluted [Abstract]
Dilutive stock options	112	91	71	80
Dilutive nonvested deferred shares	260	265	277	271
Diluted weighted average shares (shares)	26,411	26,079	26,269	26,333
Diluted EPS (US$ per share)	$ 0.25	$ 0.19	$ 0.63	$ 0.58

X

- Definition

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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Nonvested equity-based payment awards that contain forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) that result in incremental common shares.

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