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STOCK AWARD PLANS, Compensation Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
STOCK AWARD PLANS [Abstract]        
Compensation cost $ 3,231 $ 2,961 $ 5,924 $ 5,545
Income tax benefit $ 1,271 $ 1,110 $ 2,152 $ 2,079