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INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Summary of Changes in Accretable Yield for Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Beginning Balance $ 1,200,125 $ 316,521
Additions 863,681 952,271
Accretion (215,018) (130,745)
Reclassifications from (to) non-accretable difference 218,675 63,239
Disposals (67,197) (1,161)
Ending Balance $ 2,000,266 $ 1,200,125