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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value Instruments - Recurring (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Redeemable common units |  |
Fair value measurements |  |
Investment, Type [Extensible Enumeration] | Alaska communications | Alaska communications
Warrant |  |
Fair value measurements |  |
Investment, Type [Extensible Enumeration] | Alaska communications | Alaska communications
Recurring basis |  |
Fair value measurements |  |
Total assets and liabilities measured at fair value | $ (21,561) | $ (36,055)
Recurring basis | Short Term Investments |  |
Fair value measurements |  |
Investments | 300 | 300
Recurring basis | Other investments |  |
Fair value measurements |  |
Investments | 1,197 | 1,616
Recurring basis | Employee Benefit Investments |  |
Fair value measurements |  |
Investments | 3,014 |
Recurring basis | Redeemable common units |  |
Fair value measurements |  |
Derivative liabilities | (11,063) | (22,557)
Recurring basis | Redeemable common units | Alloy Inc |  |
Fair value measurements |  |
Derivative liabilities | (14,760) | (14,760)
Recurring basis | Warrant |  |
Fair value measurements |  |
Derivative liabilities | (249) | (654)
Recurring basis | Level 1 |  |
Fair value measurements |  |
Total assets and liabilities measured at fair value | 3,314 | 300
Recurring basis | Level 1 | Short Term Investments |  |
Fair value measurements |  |
Investments | 300 | 300
Recurring basis | Level 1 | Employee Benefit Investments |  |
Fair value measurements |  |
Investments | 3,014 |
Recurring basis | Level 3 |  |
Fair value measurements |  |
Total assets and liabilities measured at fair value | (24,875) | (36,355)
Recurring basis | Level 3 | Other investments |  |
Fair value measurements |  |
Investments | 1,197 | 1,616
Recurring basis | Level 3 | Redeemable common units |  |
Fair value measurements |  |
Derivative liabilities | (11,063) | (22,557)
Recurring basis | Level 3 | Redeemable common units | Alloy Inc |  |
Fair value measurements |  |
Derivative liabilities | (14,760) | (14,760)
Recurring basis | Level 3 | Warrant |  |
Fair value measurements |  |
Derivative liabilities | $ (249) | $ (654)

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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