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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Carrying Value | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Carrying value and estimated fair value of financial instruments    
Cash and Cash Equivalents $ 6,760 $ 10,214
Restricted Cash 8,057 7,605
Carrying Value | Significant Other Observable Inputs (Level 2)    
Carrying value and estimated fair value of financial instruments    
Commercial Loans and Investments 66,552 61,849
Long-Term Debt 542,020 495,370
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Carrying value and estimated fair value of financial instruments    
Cash and Cash Equivalents 6,760 10,214
Restricted Cash 8,057 7,605
Estimated Fair Value | Significant Other Observable Inputs (Level 2)    
Carrying value and estimated fair value of financial instruments    
Commercial Loans and Investments 68,156 63,261
Long-Term Debt $ 523,310 $ 473,807