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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