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STOCK-BASED COMPENSATION - Stock-based employee compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
STOCK-BASED COMPENSATION        
Pre-tax expense $ 3,325 $ 2,702 $ 6,012 $ 5,362
After tax expense $ 2,112 $ 1,716 $ 3,818 $ 3,405