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LEASES (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020
Lessee, Lease, Details [Line Items] |  |  |
Finance lease assets - accumulated depreciation | $ (3,918,007) | $ (3,702,807) |
Operating lease liability - current | 13,610 | 1,883 |
Operating lease liability - noncurrent | 87,610 | 13,509 |
Operating cash flows for operating leases | 13,245 | 6,213 |
Financing cash flows for finance lease | 1,949 | 1,764 |
Right-of-use assets obtained in exchange for operating lease liability (noncash) | 99,547 | 4,097 |
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 | 17,162 | 6,803 |
Finance lease - Amortization of lease assets | 1,131 | 1,131 |
Finance Lease - Interest on lease liabilities | 2,537 | 2,721 |
Total lease cost | $ 20,830 | $ 10,655 |
Weighted-Average Remaining Lease Term [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 8 years 3 months 18 days | 10 years 4 months 24 days |
Finance Lease, Weighted Average Remaining Lease Term | 7 years 9 months 18 days | 8 years 9 months 18 days |
Weighted-Average Discount Rate [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 3.20% | 4.58% |
Finance Lease, Weighted Average Discount Rate, Percent | 10.00% | 10.00% |
Maturity of Finance Lease Liability [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
2021 | $ 4,500 |  |
2022 | 4,500 |  |
2023 | 4,500 |  |
2024 | 4,500 |  |
2025 | 4,500 |  |
2026 and beyond | 12,600 |  |
Total lease payments | 35,100 |  |
Less: Interest | 10,800 |  |
Present value of finance lease liabilities | 24,300 |  |
Maturity of Operating Lease Liabilities [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
2021 | 16,500 |  |
2022 | 15,100 |  |
2023 | 13,800 |  |
2024 | 12,500 |  |
2025 | 11,100 |  |
2026 and beyond | 47,100 |  |
Total lease payments | 116,100 |  |
Less: Interest | 14,900 |  |
Present value of operating lease liabilities | 101,200 |  |
Lease Assets and Liabilities Included in the Consolidated Balance Sheet [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Operating lease assets - Other assets | 100,154 | $ 15,147 |
Finance lease assets - PPE | 28,286 | 28,286 |
Finance lease assets - accumulated depreciation | (2,451) | (1,320) |
Total leased assets | 125,989 | 42,113 |
Operating lease liability - current | 13,610 | 1,883 |
Finance lease liability - current | 2,153 | 1,949 |
Operating lease liability - noncurrent | 87,610 | 13,509 |
Finance lease liability - other deferred credits | 22,143 | 24,296 |
Total lease liabilities | $ 125,516 | $ 41,637 |

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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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