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LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
Lessor, Lease, Description [Line Items] |  |  |
2022 (excluding the three months ended March 31, 2022) | $ 16,310 |  |
Year 1 | 18,466 | $ 20,474 |
Year 2 | 16,996 | 17,941 |
Year 3 | 14,156 | 16,634 |
Year 4 | 10,047 | 13,640 |
Year 5 |  | 9,610 |
Thereafter | 68,363 |  |
Thereafter |  | 65,902 |
Total lease payments | 144,338 | 144,201 |
Less imputed interest | (42,399) | (42,333) |
Total | $ 101,939 | $ 101,868 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Lease Liability, Current, Lease Liability, Noncurrent | Lease Liability, Current, Lease Liability, Noncurrent |
Finance lease liability |  |  |
2022 (excluding the three months ended March 31, 2022) | $ 1,092 |  |
Year 1 | 1,463 | $ 1,269 |
Year 2 | 1,354 | 1,278 |
Year 3 | 1,132 | 1,169 |
Year 4 | 532 | 975 |
Year 5 |  | 484 |
Thereafter |  | 3,145 |
Thereafter | 3,145 |  |
Total lease payments | 8,718 | 8,320 |
Less imputed interest | (2,211) | (2,268) |
Finance lease liability | $ 6,507 | $ 6,052 | $ 2,200
Finance Lease, Liability, Statement of Financial Position [Extensible List] | Lease Liability, Current, Lease Liability, Noncurrent | Lease Liability, Current, Lease Liability, Noncurrent |
Maturities of future undiscounted lease payments |  |  |
2022 (excluding the three months ended March 31, 2022) | $ 4,042 |  |
2023 | 4,807 |  |
2024 | 4,406 |  |
2025 | 4,288 |  |
2026 | 3,916 |  |
Thereafter | 10,455 |  |
Total future lease payments | 31,914 |  |
Network asset |  |  |
Finance lease liability |  |  |
Lease income | $ 1,000 |  |

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