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SIGNIFICANT ACCOUNTING POLICIES - Schedule of Interest Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Interest income from loans held for investment, excluding non-controlling interests   $ 97,506 $ 77,424
Interest income from non-controlling interest investment held by third parties $ 0 35 4,539
Interest and Fee Income, Loans and Leases Held-in-portfolio $ 118,284 $ 97,541 $ 81,963