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FAIR VALUE MEASUREMENTS (Other Fair Value Narrative) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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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

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