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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, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share, Basic [Abstract]
Net income	$ 11,396	$ 6,521	$ 28,254	$ 16,641
Weighted average shares outstanding - basic (shares)	26,374	26,039	26,244	25,921
Basic EPS (US$ per share)	$ 0.43	$ 0.25	$ 1.08	$ 0.64
Earnings Per Share, Diluted [Abstract]
Dilutive stock options	187	112	176	71
Dilutive nonvested deferred shares	479	260	478	277
Diluted weighted average shares (shares)	27,040	26,411	26,898	26,269
Diluted EPS (US$ per share)	$ 0.42	$ 0.25	$ 1.05	$ 0.63

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units 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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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