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LEASES (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Lessee, Lease, Details [Line Items] |  |  |
Lease, Operating Lease, Lease not Yet Commenced, Liability | $ 75,600 |  |
Operating cash flows for operating leases | 6,213 |  |
Financing cash flows for finance lease | 1,764 |  |
Right-of-Use Assets Obtained in Exchange for Operating Lease Liability | $ 4,097 |  |
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract | 10 years |  |
Finance lease assets- Accumulated depreciation | $ (3,702,807) |  | $ (3,264,312)
Finance lease liability - current | 1,949 |  | 1,765
Finance lease, liability - noncurrent | 24,296 |  | $ 26,244
Lease Assets and Liabilities Included in the Consolidated Balance Sheet [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Operating lease assets - Other assets | 15,147 |  |
Operating lease, liabilities - Other current liabilities | 1,883 |  |
Finance lease assets - PPE | 28,286 |  |
Finance lease assets- Accumulated depreciation | (1,320) |  |
Total leased assets | 42,113 |  |
Finance lease liability - current | 1,949 |  |
Operating lease, liabilities - Other deferred credits | 13,509 |  |
Finance lease, liability - noncurrent | 24,296 |  |
Total lease liabilities | 41,637 |  |
Components of Lease Cost [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Operating leases - Operations and maintenance | 6,803 |  |
Finance lease - Amortization of lease assets | 1,131 |  |
Finance Lease - Interest on lease liabilities | 2,721 |  |
Total lease cost | $ 10,655 |  |
Weighted-Average Remaining Lease Term [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 10 years 4 months 24 days |  |
Finance Lease, Weighted Average Remaining Lease Term | 8 years 9 months 18 days |  |
Weighted-Average Discount Rate [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 4.58% |  |
Finance Lease, Weighted Average Discount Rate, Percent | 10.00% |  |
Maturity of Finance Lease Liability [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
2020 | $ 4,500 |  |
2021 | 4,500 |  |
2022 | 4,500 |  |
2023 | 4,500 |  |
2024 | 4,500 |  |
2025 and beyond | 17,100 |  |
Total lease payments | 39,600 |  |
Less: Interest | 13,400 |  |
Present value of lease liabilities | 26,200 |  |
Maturity of Operating Lease Liabilities [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
2020 | 2,500 |  |
2021 | 2,100 |  |
2022 | 2,000 |  |
2023 | 1,900 |  |
2024 | 1,900 |  |
2025 and beyond | 9,200 |  |
Total lease payments | 19,600 |  |
Less: Interest | 4,200 |  |
Present value of lease liabilities | $ 15,400 |  |
Accounting Standards Update 2016-02 [Member] |  |  |
Lessee, Lease, Details [Line Items] |  |  |
Operating lease assets - Other assets |  | $ 17,500 |
Present value of lease liabilities |  | 28,000 |
Present value of lease liabilities |  | 17,400 |
Finance lease assets - PPE |  | $ 28,100 |

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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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