LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Lessor, Lease, Description [Line Items]
2023 (excluding the six months ended June 30, 2023)	$ 11,716		$ 11,716
Year 1	18,425		18,425		$ 19,417
Year 2	15,101		15,101		17,836
Year 3	10,933		10,933		14,805
Year 4	8,736		8,736		10,505
Year 5					8,096
Thereafter	84,450		84,450
Thereafter					76,452
Total lease payments	149,361		149,361		147,111
Less imputed interest	(58,470)		(58,470)		(53,794)
Total	$ 90,891		$ 90,891		$ 93,317
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
2023 (excluding the six months ended June 30, 2023)	$ 1,474		$ 1,474
Year 1	2,128		2,128		$ 1,403
Year 2	1,020		1,020		1,342
Year 3	550		550		978
Year 4	511		511		504
Year 5					495
Thereafter					2,651
Thereafter	2,651		2,651
Total lease payments	8,334		8,334		7,373
Less imputed interest	(1,858)		(1,858)		(1,914)
Total	$ 6,476		$ 6,476		$ 5,459
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
2023 (excluding the six months ended June 30, 2023)	$ 3,110		$ 3,110
2024	5,917		5,917
2025	5,733		5,733
2026	5,419		5,419
2027	4,270		4,270
Thereafter	14,394		14,394
Total future lease payments	38,843		38,843
Network asset
Finance lease liability
Lease income	$ 2,000	$ 1,900	$ 3,900	$ 2,900