LEASES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Jul. 22, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
LEASES
Operating lease right-of-use assets	$ 118,843		$ 63,235
Total equity	$ 702,253		$ 754,336	$ 806,083	$ 823,324
Package of practical expedients	true
Alaska communications
LEASES
Operating lease right-of-use assets		$ 60,402
Lease liabilities		$ 46,700
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-02
LEASES
Operating lease right-of-use assets					70,800
Short-term lease liability					8,200
Long-term lease liability					61,200
Total equity					$ 0
Minimum
LEASES
Operating lease, lease term	3 years
Finance lease, lease term	3 years
Maximum
LEASES
Operating lease, lease term	10 years
Finance lease, lease term	10 years