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COMMERCIAL REAL ESTATE INVESTMENTS - Minimum Future Rentals to be Received on Noncancelable Operating Leases (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Investment Company [Abstract]  
2018 (remaining) $ 22,306
2019 26,423
2020 21,708
2021 17,302
2022 12,356
Later years 20,687
Total minimum future rental receivable $ 120,782