INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance	$ 3,000	$ 11,100
Valuation allowance for deferred tax assets	65,887	$ 62,865
Federal
Operating Loss Carryforwards [Line Items]
Gross net operating losses	136,300
State
Operating Loss Carryforwards [Line Items]
Gross net operating losses	$ 1,500,000