SEGMENT INFORMATION (Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 850,616	$ 1,010,731
Consolidated Adjusted EBITDA	13,327	17,709
Depreciation and amortization expense	2,579	1,958
Stock compensation expense	9,660	7,798
Stock option expense	2,761	3,511
Operating profit	(1,673)	4,442
Operating segments | North American Realty
Segment Reporting Information [Line Items]
Revenues	837,114	1,001,880
Consolidated Adjusted EBITDA	21,203	28,770
Operating segments | International Realty
Segment Reporting Information [Line Items]
Revenues	10,758	7,094
Consolidated Adjusted EBITDA	(3,676)	(1,956)
Operating segments | Virbela
Segment Reporting Information [Line Items]
Revenues	2,163	1,813
Consolidated Adjusted EBITDA	(1,296)	(2,771)
Operating segments | Other Affiliated Services
Segment Reporting Information [Line Items]
Revenues	1,677	838
Consolidated Adjusted EBITDA	(681)	(829)
Operating segments | Corporate expenses and other
Segment Reporting Information [Line Items]
Consolidated Adjusted EBITDA	(2,223)	(5,505)
Segment eliminations
Segment Reporting Information [Line Items]
Revenues	$ (1,096)	$ (894)