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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 |

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