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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, 2015
Dec. 31, 2014
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Beginning Balance $ 181,671 $ 143,067
Additions 172,828 189,252
Accretion (42,800) (14,035)
Reclassifications from (to) non-accretable difference (36,326) 20,385
Disposals (105,593) (156,998)
Ending Balance 316,521 181,671
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 $ 146,741 $ 0