INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Tax Examination [Line Items]
Income tax provision (benefit)	$ 4,900	$ 5,140	$ (7,062)	$ (598)
Effective income tax rate (as a percent)		(16.00%)
Unrecognized tax benefits, including interest	3,500		3,500		$ 2,400
Unrecognized tax benefits that if subsequently recognized would reduce income tax expense	3,400		3,400		2,400
Reasonably possible decrease in unrecognized tax benefit due to potential settlements	1,400		1,400
Federal and State Tax Credits
Income Tax Examination [Line Items]
Gross deferred tax asset	151,400		151,400
Portion of deferred tax assets that will be utilized upon future reversal of deferred tax liabilities	33,600		33,600
Portion of deferred tax assets that will be utilized based on forecasts of future taxable income	117,800		117,800
IAC
Income Tax Examination [Line Items]
Unrecognized tax benefits, including interest	$ 2,700		$ 2,700		$ 2,100