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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Computation of Basic and Diluted Shares
Net income	$ 7,118	$ 4,301	$ 21,271	$ 12,074
Weighted average shares outstanding - basic	7,525,489	7,374,600	7,507,937	7,347,376
Dilutive potential shares from unvested restricted shares	208,820	222,401	293,136	320,475
Weighted average shares outstanding - diluted	7,734,309	7,597,001	7,801,073	7,667,851
Earnings per share:
Basic	$ 0.95	$ 0.58	$ 2.83	$ 1.64
Diluted	$ 0.92	$ 0.57	$ 2.73	$ 1.57

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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- Definition

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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- Definition

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

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