INCOME TAXES - Summary of Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax [Line Items]
Income (loss) before income taxes	$ 9,757	$ 57,475	$ (310,041)
Domestic
Income Tax [Line Items]
Income (loss) before income taxes	9,781	38,918	(298,351)
Foreign
Income Tax [Line Items]
Income (loss) before income taxes	$ (24)	$ 18,557	$ (11,690)