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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Allowance for Credit Losses) (Details)
Dec. 31, 2023
numberOfReceivable
portfolioSegment
Accounting Policies [Abstract]  
Number of portfolio segments | portfolioSegment 5
Number of classes of trade receivables based on location 2
Number of trade receivables in information services portfolio 4
Number of trade receivables in multifamily portfolio 1
Number of trade receivables in loopnet portfolio 1
Number of trade receivables in other marketplaces portfolio segment 2