LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessor, Lease, Description [Line Items]
Year 1	$ 18,048	$ 19,417
Year 2	16,022	17,836
Year 3	11,755	14,805
Year 4	9,327	10,505
Year 5	7,807	8,096
Thereafter	80,637	76,452
Total lease payments	143,596	147,111
Less imputed interest	(57,133)	(53,794)
Total	$ 86,463	$ 93,317
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Lease Liability, Current, Lease Liability, Noncurrent	Lease Liability, Current, Lease Liability, Noncurrent
Finance lease liability
Year 1	$ 2,030	$ 1,403
Year 2	1,488	1,342
Year 3	601	978
Year 4	534	504
Year 5	505	495
Thereafter	2,145	2,651
Total lease payments	7,303	7,373
Less imputed interest	(1,662)	(1,914)
Total	$ 5,641	$ 5,459
Finance Lease, Liability, Statement of Financial Position [Extensible List]	Lease Liability, Current, Lease Liability, Noncurrent	Lease Liability, Current, Lease Liability, Noncurrent
Finance Lease, Principal Payments	$ 1,375	$ 1,069
Maturities of future undiscounted lease payments
2024	7,039
2025	6,760
2026	6,398
2027	5,212
2028	4,865
Thereafter	12,510
Total future lease payments	42,784
International Telecom
Finance lease liability
Total lease payments	14,400
Finance Lease, Principal Payments	10,200
Network asset
Finance lease liability
Lease income	$ 7,800	$ 6,300	$ 4,500
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenues	Revenues	Revenues