Annual report pursuant to Section 13 and 15(d)

INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Summary of Activity Related to Credit Losses on Debt Securities (Details)

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INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Summary of Activity Related to Credit Losses on Debt Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning balance of credit losses on debt securities for which a portion of an OTTI was recognized in other comprehensive income $ 52,803 $ 23,821
Increases to credit losses on securities for which an OTTI was previously recognized and a portion of an OTTI was recognized in other comprehensive income 23,059 16,924
Additions for credit losses on securities for which an OTTI was not previously recognized 2,115 13,093
Reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis 0 0
Reduction for credit losses on securities for which no OTTI was recognized in other comprehensive income at the current measurement date 0 0
Reduction for securities sold/paid off during the period (18,914) (1,035)
Ending balance of credit losses on debt securities for which a portion of an OTTI was recognized in other comprehensive income $ 59,063 $ 52,803