SEGMENT INFORMATION (Financial Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 4,598,161	$ 3,771,170	$ 1,798,285
Consolidated Adjusted EBITDA	60,549	77,995	57,841
Depreciation and amortization expense	9,838	6,248	4,214
Stock compensation expense	30,861	24,493	15,239
Stock option expense	14,442	13,102	6,801
Operating profit	5,408	34,152	31,587
Operating segments | North American Realty
Segment Reporting Information [Line Items]
Revenues	4,552,938	3,745,354	1,791,446
Consolidated Adjusted EBITDA	103,255	116,800	73,649
Operating segments | International Realty
Segment Reporting Information [Line Items]
Revenues	35,924	17,804	2,004
Consolidated Adjusted EBITDA	(13,708)	(9,138)	(1,615)
Operating segments | Virbela
Segment Reporting Information [Line Items]
Revenues	8,485	8,615	5,736
Consolidated Adjusted EBITDA	(9,642)	(12,637)	(5,017)
Operating segments | Other Affiliated Services
Segment Reporting Information [Line Items]
Revenues	5,084	2,896	327
Consolidated Adjusted EBITDA	(2,600)	(3,322)	(380)
Operating segments | Corporate and Other
Segment Reporting Information [Line Items]
Consolidated Adjusted EBITDA	(16,756)	(13,708)	(8,796)
Elimination
Segment Reporting Information [Line Items]
Revenues	$ (4,270)	$ (3,499)	$ (1,228)