Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Schedule of the Outstanding Face Amount and Carrying Value for Securities Uncollectible (Details)

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INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Schedule of the Outstanding Face Amount and Carrying Value for Securities Uncollectible (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Outstanding Face Amount $ 6,194,163 $ 6,385,306
Carrying Value $ 4,203,445 $ 4,217,242