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LEASES - Maturities of lease liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Lessor, Lease, Description [Line Items]      
2023 (excluding the three months ended March 31, 2023) $ 12,977    
Year 1 17,023   $ 19,417
Year 2 13,897   17,836
Year 3 9,771   14,805
Year 4 7,708   10,505
Year 5     8,096
Thereafter 79,134    
Thereafter     76,452
Total lease payments 140,510   147,111
Less imputed interest (53,450)   (53,794)
Total $ 87,060   $ 93,317
Operating Lease, Liability, Statement of Financial Position [Extensible List] Lease Liability, Current, Lease Liability, Noncurrent   Lease Liability, Current, Lease Liability, Noncurrent
Finance lease liability      
2023 (excluding the three months ended March 31, 2023) $ 1,045    
Year 1 1,240   $ 1,403
Year 2 972   1,342
Year 3 504   978
Year 4 495   504
Year 5     495
Thereafter     2,651
Thereafter 2,651    
Total lease payments 6,907   7,373
Less imputed interest (1,822)   (1,914)
Total $ 5,085   $ 5,459
Finance Lease, Liability, Statement of Financial Position [Extensible List] Lease Liability, Current, Lease Liability, Noncurrent   Lease Liability, Current, Lease Liability, Noncurrent
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues  
Maturities of future undiscounted lease payments      
2023 (excluding the three months ended March 31, 2023) $ 4,609    
2024 5,891    
2025 5,716    
2026 5,410    
2027 4,267    
Thereafter 14,360    
Total future lease payments 40,253    
Network asset      
Finance lease liability      
Lease income $ 1,900 $ 1,000