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FAIR VALUE MEASUREMENTS AND INVESTMENTS - Recurring (Details) - Recurring basis - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Fair value measurements    
Total assets and liabilities measured at fair value $ (18,321) $ (18,567)
Alaska communications    
Fair value measurements    
Derivative liabilities   (22,640)
Money market funds    
Fair value measurements    
Cash and cash equivalents 2,716 3,301
Short Term Investments    
Fair value measurements    
Investments 300 300
Other investments    
Fair value measurements    
Investments 1,862 1,925
Redeemable common units    
Fair value measurements    
Derivative liabilities (22,640)  
Warrant    
Fair value measurements    
Derivative liabilities (559) (559)
Interest rate swap    
Fair value measurements    
Derivative liabilities   (894)
Level 1    
Fair value measurements    
Total assets and liabilities measured at fair value 3,016 3,601
Level 1 | Money market funds    
Fair value measurements    
Cash and cash equivalents 2,716 3,301
Level 1 | Short Term Investments    
Fair value measurements    
Investments 300 300
Level 2    
Fair value measurements    
Total assets and liabilities measured at fair value   (894)
Level 2 | Interest rate swap    
Fair value measurements    
Derivative liabilities   (894)
Level 3    
Fair value measurements    
Total assets and liabilities measured at fair value (21,337) (21,274)
Level 3 | Alaska communications    
Fair value measurements    
Derivative liabilities   (22,640)
Level 3 | Other investments    
Fair value measurements    
Investments 1,862 1,925
Level 3 | Redeemable common units    
Fair value measurements    
Derivative liabilities (22,640)  
Level 3 | Warrant    
Fair value measurements    
Derivative liabilities $ (559) $ (559)