DISCONTINUED OPERATIONS - Schedule of financial information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 0	$ 0	$ 0
Other operating expenses	(33,308)	(35,002)	(16,228)
Loss before income taxes	(33,308)	(30,487)	(16,228)
Income tax benefit	7,619	8,855	3,408
Loss from discontinued operations, net of tax	(25,689)	(21,632)	(12,820)
Home Loan Center, Inc. | Disposed of by means other than sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal	$ 0	$ 4,515	$ 0