FAIR VALUE MEASUREMENTS AND INVESTMENTS - Recurring (Details) - Recurring basis - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair value measurements
Total assets and liabilities measured at fair value	$ (19,061)	$ (21,561)
Short Term Investments
Fair value measurements
Investments	300	300
Other investments
Fair value measurements
Investments	1,076	1,197
Employee benefit plan investments
Fair value measurements
Investments	2,991	3,014
Redeemable common units | Alloy Inc
Fair value measurements
Financial instruments	(14,760)	(14,760)
Redeemable common units | Alaska communications
Fair value measurements
Financial instruments	(8,419)	(11,063)
Warrants | Alaska communications
Fair value measurements
Financial instruments	(249)	(249)
Level 1
Fair value measurements
Total assets and liabilities measured at fair value	3,291	3,314
Level 1 | Short Term Investments
Fair value measurements
Investments	300	300
Level 1 | Employee benefit plan investments
Fair value measurements
Investments	2,991	3,014
Level 3
Fair value measurements
Total assets and liabilities measured at fair value	(22,352)	(24,875)
Level 3 | Other investments
Fair value measurements
Investments	1,076	1,197
Level 3 | Redeemable common units | Alloy Inc
Fair value measurements
Financial instruments	(14,760)	(14,760)
Level 3 | Redeemable common units | Alaska communications
Fair value measurements
Financial instruments	(8,419)	(11,063)
Level 3 | Warrants | Alaska communications
Fair value measurements
Financial instruments	$ (249)	$ (249)