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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