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Present value of lessee's discounted obligation for lease payments from operating lease not yet commenced.

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Total leased assets.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of interest expense on finance lease liability.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Weighted average discount rate for finance lease calculated at point in time.

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of lease cost recognized by lessee for lease contract.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in next fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of lessee's right to use underlying asset under operating lease.

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Weighted average discount rate for operating lease calculated at point in time.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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LEASES (Details) - USD ($) $ in Thousands	12 Months Ended
LEASES (Details) - USD ($) $ in Thousands	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