Quarterly report pursuant to Section 13 or 15(d)

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Income tax expense (benefit) $ (2,574) $ (726) $ (3,312) $ (2,829)  
Effective tax rate 18.70% 17.40% 20.30% 22.60%  
Unrecognized tax benefits $ 100   $ 100   $ 100