COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - case	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Defined contribution match		4.00%	4.00%	4.00%
Pending litigation claims, number (case)		16
Subsequent Event
Loss Contingencies [Line Items]
Defined contribution match	4.00%