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LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Lessor, Lease, Description [Line Items]
2024 (excluding the nine months ended September 30, 2024)	$ 4,957		$ 4,957
Year 1	18,858		18,858		$ 18,048
Year 2	15,023		15,023		16,022
Year 3	12,143		12,143		11,755
Year 4	9,273		9,273		9,327
Year 5					7,807
Thereafter	84,025		84,025
Thereafter					80,637
Total lease payments	144,279		144,279		143,596
Less imputed interest	(56,694)		(56,694)		(57,133)
Total	$ 87,585		$ 87,585		$ 86,463
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Lease Liability, Current, Lease Liability, Noncurrent		Lease Liability, Current, Lease Liability, Noncurrent		Lease Liability, Current, Lease Liability, Noncurrent
Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
2024 (excluding the nine months ended September 30, 2024)	$ 543		$ 543
Year 1	1,541		1,541		$ 2,030
Year 2	721		721		1,488
Year 3	685		685		601
Year 4	554		554		534
Year 5					505
Thereafter					2,145
Thereafter	2,145		2,145
Total lease payments	6,189		6,189		7,303
Less imputed interest	(1,431)		(1,431)		(1,662)
Total	$ 4,758		$ 4,758		$ 5,641
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Lease Liability, Current, Lease Liability, Noncurrent		Lease Liability, Current, Lease Liability, Noncurrent		Lease Liability, Current, Lease Liability, Noncurrent
Lease income	$ 2,075	$ 1,948	$ 6,293	$ 5,810
Maturities of future undiscounted lease payments
2024 (excluding the nine months ended September 30, 2024)	1,837		1,837
2025	7,178		7,178
2026	6,848		6,848
2027	5,624		5,624
2028	5,228		5,228
Thereafter	13,568		13,568
Total future lease payments	40,283		40,283
Network asset
Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
Lease income	$ 2,100	$ 1,900	$ 6,300	$ 5,800

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