INCOME TAXES - Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current	$ 0	$ (1,719)
Deferred benefit	(5,090)	(4,474)
Write-down of net deferred tax asset resulting from the Tax Cuts and Jobs Act	0	3,595
Change in valuation allowance	11,056	0
Total income tax (benefit) expense	$ 5,966	$ (2,598)