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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Carrying Value | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Carrying value and estimated fair value of financial instruments    
Cash and Cash Equivalents $ 8,615 $ 4,289
Restricted Cash 22,734 29,536
Carrying Value | Significant Other Observable Inputs (Level 2) [Member]    
Carrying value and estimated fair value of financial instruments    
Commercial Loan Investments 39,095 38,320
Long-Term Debt 278,273 273,830
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Carrying value and estimated fair value of financial instruments    
Cash and Cash Equivalents 8,615 4,289
Restricted Cash 22,734 29,536
Estimated Fair Value | Significant Other Observable Inputs (Level 2) [Member]    
Carrying value and estimated fair value of financial instruments    
Commercial Loan Investments 39,109 38,318
Long-Term Debt $ 288,000 $ 282,884