EARNINGS PER SHARE (Reconcilement of the Denominators of the Basic and Diluted EPS Computations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reconcilement of the denominators of the basic and diluted EPS computations
Net income, basic	$ 9,463	$ 8,420	$ 18,446	$ 16,343
Weighted Average Common Shares, Basic	24,722	25,868	24,892	25,900
Basic, Per Share Amount	$ 0.38	$ 0.32	$ 0.74	$ 0.63
Add: potentially dilutive common shares - stock awards, Weighted Average Common Shares	80	20	78	24
Diluted, Net Income Available to Common Shareholders	$ 9,463	$ 8,420	$ 18,446	$ 16,343
Diluted, Weighted Average Common Shares	24,802	25,888	24,970	25,924
Diluted, Per Share Amount	$ 0.38	$ 0.32	$ 0.74	$ 0.63

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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+ Details

- 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.

+ References+ Details

- Definition

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

+ References

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-Appendix A

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+ Details

- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

+ References

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+ Details