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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting Balance Sheet (Details) $ in Thousands	Dec. 31, 2019 USD ($)
MNA counterparty
Offsetting Liabilities [Line Items]
Derivative Liabilities	$ (4,669)
Derivative Assets	4,669
Cash Collateral Pledged	10,700
Net Amount	0
RPA counterparty
Offsetting Liabilities [Line Items]
Derivative Liabilities	(3,377)
Derivative Assets	3,377
Cash Collateral Pledged	0
Net Amount	0
Total
Offsetting Liabilities [Line Items]
Derivative Liabilities	(8,046)
Derivative Assets	8,046
Cash Collateral Pledged	10,700
Net Amount	$ 0

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