Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Variable Interest Entities, Noncontrolling Interest (Details)

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INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Variable Interest Entities, Noncontrolling Interest (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Noncontrolling Interest [Line Items]        
Noncontrolling Interests in Income of Consolidated Subsidiaries $ 10,869 $ 13,600 $ 32,058 $ 45,051
VIE, consolidated | Shelter Mortgage Company, LLC        
Noncontrolling Interest [Line Items]        
Consolidated Equity In Joint Ventures 16,526   16,526  
Interest in JVs $ 8,362   8,362  
Net Income (Loss) Attributable to Joint Ventures     $ 2,306  
Ownership interest 50.60%   50.60%  
Noncontrolling ownership interest in net income     50.60%  
Noncontrolling Interests in Income of Consolidated Subsidiaries     $ 1,167