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LEASES - Maturities of lease liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Lessor, Lease, Description [Line Items]          
2023 (excluding the nine months ended September 30, 2023) $ 4,896   $ 4,896    
Year 1 19,349   19,349   $ 19,417
Year 2 15,811   15,811   17,836
Year 3 11,498   11,498   14,805
Year 4 9,129   9,129   10,505
Year 5         8,096
Thereafter 88,052   88,052    
Thereafter         76,452
Total lease payments 148,735   148,735   147,111
Less imputed interest (58,122)   (58,122)   (53,794)
Total $ 90,613   $ 90,613   $ 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 nine months ended September 30, 2023) $ 535   $ 535    
Year 1 2,153   2,153   $ 1,403
Year 2 1,341   1,341   1,342
Year 3 542   542   978
Year 4 511   511   504
Year 5         495
Thereafter         2,651
Thereafter 2,651   2,651    
Total lease payments 7,733   7,733   7,373
Less imputed interest (1,755)   (1,755)   (1,914)
Total $ 5,978   $ 5,978   $ 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) $ 1,891   $ 1,891    
2024 6,587   6,587    
2025 6,394   6,394    
2026 6,062   6,062    
2027 4,874   4,874    
Thereafter 15,641   15,641    
Total future lease payments 41,449   41,449    
Network asset          
Finance lease liability          
Lease income $ 1,900 $ 1,500 $ 5,800 $ 4,400