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BASIS OF PRESENTATION (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
BASIS OF PRESENTATION          
Income tax expense $ 3,683   $ 4,117 $ 10,317 $ 8,172
Accounting Standards Update 2016-09          
BASIS OF PRESENTATION          
Income tax expense   $ (402)      
Cumulative adjustment to retained earnings       $ 0