INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Examination [Line Items]
Income tax expense (benefit)	$ (14,215)	$ (3,985)
Effective income tax rate (as a percent)	(326.00%)	(30.00%)
Unrecognized tax benefits including interest	$ 2,500		$ 2,400
Unrecognized tax benefit, if subsequently recognized would reduce income tax expense	2,500		$ 2,400
Decrease in unrecognized tax benefit, reasonably possible within twelve months	1,000
Federal and State Tax Credits
Income Tax Examination [Line Items]
Gross deferred tax asset	130,300
Portion of deferred tax assets that will be utilized upon future reversal of deferred tax liabilities	33,600
Portion of deferred tax assets that will be utilized based on forecasts of future taxable income	$ 96,700