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EARNINGS PER SHARE DATA (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Basic [Abstract] |  |  |  |
Weighted average shares outstanding (in shares) | 14,708 | 14,451 | 14,716 | 14,424
Net income | $ 15,539 | $ 13,749 | $ 27,157 | $ 26,981
Convertible preferred stock dividend | 22 | 22 | 45 | 45
Net income attributable to common shareholders | 15,517 | 13,727 | 27,112 | 26,936
Per share amount (in dollars per share) | $ 1.06 | $ 0.95 | $ 1.84 | $ 1.87
Diluted [Abstract] |  |  |  |
Weighted average shares outstanding (in shares) | 14,708 | 14,451 | 14,716 | 14,424
Assumed conversion of convertible preferred stock (in shares) | 840 | 840 | 840 | 840
Total dilutive shares (in shares) | 15,548 | 15,291 | 15,556 | 15,264
Net income attributable to common shareholders | 15,517 | 13,727 | 27,112 | 26,936
Convertible preferred stock dividend | 22 | 22 | 45 | 45
Net income for diluted earnings per share | $ 15,539 | $ 13,749 | $ 27,157 | $ 26,981
Per share amount (in dollars per share) | $ 1.00 | $ 0.90 | $ 1.75 | $ 1.77

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