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STOCK AWARD PLANS, Compensation Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
STOCK AWARD PLANS [Abstract]        
Compensation cost $ 3,098 $ 3,067 $ 16,649 $ 8,991
Income tax benefit $ 709 $ 1,234 $ 4,747 $ 3,386