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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
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 $ 9,450 $ 8,615
Restricted Cash 26,385 22,734
Carrying Value | Significant Other Observable Inputs (Level 2) [Member]    
Carrying value and estimated fair value of financial instruments    
Commercial Loan and Master Lease Investments 21,830 39,095
Long-Term Debt 298,079 278,273
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 9,450 8,615
Restricted Cash 26,385 22,734
Estimated Fair Value | Significant Other Observable Inputs (Level 2) [Member]    
Carrying value and estimated fair value of financial instruments    
Commercial Loan and Master Lease Investments 21,922 39,109
Long-Term Debt $ 301,902 $ 288,000