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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