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INCOME TAXES - NARRATIVE (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2019
Income Tax Disclosure [Abstract]            
Statutory federal tax rate   28.10% 21.00% 28.10% 35.00%  
Provisional adjustment to deferred tax assets as result of Tax Act $ 9,189          
Deferred tax liability recognized from acquisition           $ 2,200
Reduction in effective tax rate for tax credits received     1.55% 2.38% 0.19%