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FAIR VALUE MEASUREMENTS (Other Fair Value Narrative) (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Amortized cost $ 416,879,000 $ 0
Fair value 416,821,000 0
Reported value measurement    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Notes payable 1,311,000,000 1,310,000,000
Estimate of fair value measurement    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Notes payable $ 1,471,000,000 $ 1,485,000,000