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INVESTMENTS IN REAL ESTATE SECURITIES - Summary of Changes in Accretable Yield for Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Beginning Balance $ 316,521 $ 181,671
Additions 952,271 172,828
Accretion (130,745) (42,800)
Reclassifications from (to) non-accretable difference 63,239 (36,326)
Disposals (1,161) (105,593)
Ending Balance 1,200,125 316,521
ASU 2014-11 [Member]    
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Adoption of ASU No. 2014-11 $ 0 $ 146,741