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BASIS OF PRESENTATION (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income tax expense $ 2,853   $ 1,517 $ 6,634 $ 4,055
Accounting Standards Update 2016-09          
Income tax expense   $ (397)      
Cumulative adjustment to retained earnings       $ 0