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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
segment
Dec. 31, 2021
USD ($)
segment
Revenue from Contracts with Customers (Details) [Line Items]      
Number of operating segments | segment 6 6 6
Revenues $ 1,643,600 $ 1,080,670 $ 1,554,698
Accounts receivable, net 115,496 149,110 49,673
Unbilled receivables 13,402 14,144 12,315
Deferred revenue 71,504 85,441 69,507
Deferred revenue recognized 51,107 37,254 39,906
Capitalized contract cost 8,131 5,990 1,605
Recognized expenses 4,677 3,117 580
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01      
Revenue from Contracts with Customers (Details) [Line Items]      
Revenue remaining performance obligation, amount $ 47,627    
Expected timing of satisfaction 1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01      
Revenue from Contracts with Customers (Details) [Line Items]      
Revenue remaining performance obligation, amount $ 11,206    
Expected timing of satisfaction 1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01      
Revenue from Contracts with Customers (Details) [Line Items]      
Revenue remaining performance obligation, amount $ 5,776    
Expected timing of satisfaction 1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01      
Revenue from Contracts with Customers (Details) [Line Items]      
Revenue remaining performance obligation, amount $ 2,578    
Expected timing of satisfaction 1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01      
Revenue from Contracts with Customers (Details) [Line Items]      
Revenue remaining performance obligation, amount $ 1,479    
Expected timing of satisfaction 1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01      
Revenue from Contracts with Customers (Details) [Line Items]      
Revenue remaining performance obligation, amount $ 2,838    
Expected timing of satisfaction 1 year    
Auction and Liquidation segment      
Revenue from Contracts with Customers (Details) [Line Items]      
Revenues $ 103,265 74,096 73,517
Communications Segment      
Revenue from Contracts with Customers (Details) [Line Items]      
Revenues 337,689 $ 235,655 $ 93,347
Service and Fee Revenues      
Revenue from Contracts with Customers (Details) [Line Items]      
Deferred revenue $ 71,504