LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Lessor, Lease, Description [Line Items]
2022 (excluding the nine months ended September 30, 2022)	$ 6,299	$ 6,299
Year 1	19,419	19,419	$ 20,474
Year 2	17,492	17,492	17,941
Year 3	14,569	14,569	16,634
Year 4	10,175	10,175	13,640
Year 5			9,610
Thereafter	67,749	67,749
Thereafter			65,902
Total lease payments	135,703	135,703	144,201
Less imputed interest	(40,428)	(40,428)	(42,333)
Total	$ 95,275	$ 95,275	$ 101,868
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Lease Liability, Current, Lease Liability, Noncurrent	Lease Liability, Current, Lease Liability, Noncurrent	Lease Liability, Current, Lease Liability, Noncurrent
Finance lease liability
2022 (excluding the nine months ended September 30, 2022)	$ 333	$ 333
Year 1	1,337	1,337	$ 1,269
Year 2	1,228	1,228	1,278
Year 3	1,030	1,030	1,169
Year 4	539	539	975
Year 5			484
Thereafter			3,145
Thereafter	3,145	3,145
Total lease payments	7,612	7,612	8,320
Less imputed interest	(1,999)	(1,999)	(2,268)
Finance lease liability	$ 5,613	$ 5,613	$ 6,052
Finance Lease, Liability, Statement of Financial Position [Extensible List]	Lease Liability, Current, Lease Liability, Noncurrent	Lease Liability, Current, Lease Liability, Noncurrent	Lease Liability, Current, Lease Liability, Noncurrent
Maturities of future undiscounted lease payments
2022 (excluding the nine months ended September 30, 2022)	$ 1,462	$ 1,462
2023	5,384	5,384
2024	4,951	4,951
2025	4,839	4,839
2026	4,503	4,503
Thereafter	11,216	11,216
Total future lease payments	32,355	32,355
Network asset
Finance lease liability
Lease income	$ 1,500	$ 4,400