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LEASES (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020
Lessee, Lease, Details [Line Items] |  |  |
Finance lease assets - accumulated depreciation | $ (4,500,665) | $ (3,918,007) |
Operating lease liability - current | 13,783 | 13,610 |
Operating lease liability - noncurrent | 75,636 | 87,610 |
Operating cash flows for operating leases | 15,690 | 13,245 |
Financing cash flows for finance lease | 2,307 | 1,949 |
Right-of-use assets obtained in exchange for operating lease liability (noncash) | 1,150 | 99,547 |
Lease remaining balance related to lease entered in December 2019 [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract |  |  | 10 years
Operating lease assets - Other assets |  | 69,000 |
Present value of operating lease liabilities |  | 69,900 |
Components of Lease Cost [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Operating leases - Operations and maintenance | 17,747 | 17,162 |
Finance lease - Amortization of lease assets | 1,139 | 1,131 |
Finance Lease - Interest on lease liabilities | 2,338 | 2,537 |
Total lease cost | $ 21,224 | $ 20,830 |
Weighted-Average Remaining Lease Term [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 7 years 9 months 18 days | 8 years 3 months 18 days |
Finance Lease, Weighted Average Remaining Lease Term | 6 years 7 months 6 days | 7 years 9 months 18 days |
Weighted-Average Discount Rate [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 3.40% | 3.20% |
Finance Lease, Weighted Average Discount Rate, Percent | 9.60% | 10.00% |
Maturity of Finance Lease Liability [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
2022 | $ 4,700 |  |
2023 | 4,700 |  |
2024 | 4,700 |  |
2025 | 5,400 |  |
2026 | 4,500 |  |
2027 and beyond | 8,300 |  |
Total lease payments | 32,300 |  |
Less: Interest | 8,600 |  |
Present value of finance lease liabilities | 23,700 |  |
Maturity of Operating Lease Liabilities [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
2022 | 16,400 |  |
2023 | 13,900 |  |
2024 | 12,600 |  |
2025 | 11,200 |  |
2026 | 11,400 |  |
2027 and beyond | 36,900 |  |
Total lease payments | 102,400 |  |
Less: Interest | 13,000 |  |
Present value of operating lease liabilities | 89,400 |  |
Lease Assets and Liabilities Included in the Consolidated Balance Sheet [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Operating lease assets - Other assets | 89,558 | $ 100,154 |
Finance lease assets - PPE | 29,962 | 28,286 |
Finance lease assets - accumulated depreciation | (3,590) | (2,451) |
Total leased assets | 115,930 | 125,989 |
Operating lease liability - current | 13,783 | 13,610 |
Finance lease liability - current | 2,584 | 2,153 |
Operating lease liability - noncurrent | 75,636 | 87,610 |
Finance lease liability - other deferred credits | 21,082 | 22,143 |
Total lease liabilities | $ 113,085 | $ 125,516 |

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