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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) $ in Thousands | 12 Months Ended
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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 |  |

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