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DIVIDENDS PER SHARE (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2012
DIVIDENDS PER SHARE [Abstract]            
Date declared 2013-07 2013-05   2013-07   2013-02
Cash dividend declared (in dollars per share) $ 0.30   $ 0.30      
Payment of cash dividends $ 17,800 $ 17,600 $ 17,500 $ 52,891 $ 36,626  
Date paid Sep. 11, 2013   Mar. 13, 2013      
Date of record Aug. 23, 2013   Feb. 22, 2013