LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Lessor, Lease, Description [Line Items]
2024 (excluding the three months ended March 31, 2024)	$ 13,608
Year 1	16,800		$ 18,048
Year 2	12,405		16,022
Year 3	9,542		11,755
Year 4	7,553		9,327
Year 5			7,807
Thereafter	82,078
Thereafter			80,637
Total lease payments	141,986		143,596
Less imputed interest	(56,664)		(57,133)
Total	$ 85,322		$ 86,463
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Lease Liability, Current, Lease Liability, Noncurrent		Lease Liability, Current, Lease Liability, Noncurrent
Finance lease liability
2024 (excluding the three months ended March 31, 2024)	$ 1,614
Year 1	1,394		$ 2,030
Year 2	570		1,488
Year 3	534		601
Year 4	505		534
Year 5			505
Thereafter			2,145
Thereafter	2,145
Total lease payments	6,762		7,303
Less imputed interest	(1,555)		(1,662)
Total	$ 5,207		$ 5,641
Finance Lease, Liability, Statement of Financial Position [Extensible List]	Lease Liability, Current, Lease Liability, Noncurrent		Lease Liability, Current, Lease Liability, Noncurrent
Lease income	$ 2,106	$ 1,903
Maturities of future undiscounted lease payments
2024 (excluding the three months ended March 31, 2024)	5,995
2025	7,060
2026	6,749
2027	5,559
2028	5,180
Thereafter	13,353
Total future lease payments	43,896
Network asset
Finance lease liability
Lease income	$ 2,100	$ 1,900