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COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details) - USD ($)
Oct. 25, 2019
Sep. 30, 2019
Sunrise Wind, LLC | Subsequent Event    
Guarantor Obligations [Line Items]    
Maximum exposure (up to) $ 15,400,000  
Ownership interest 50.00%  
Guarantee of Financial Obligations of NPT    
Guarantor Obligations [Line Items]    
Maximum exposure (up to)   $ 25,000,000