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SECURITIES (Details 3) - Successor Company - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Concentration risk    
Securities $ 229,206 $ 417,519
Estimated fair value of securities pledged as collateral    
Pledged as collateral for collateralized loan obligation secured debt 13,337 170,365
Total $ 13,337 $ 170,365
Corporate Debt Securities | Percent to total investment in corporate loans, debt securities and other investments | Top three largest    
Concentration risk    
Concentration risk of total fair value (as a percent) 71.00% 52.00%
Securities $ 134,700 $ 192,500
Corporate Debt Securities | Percent to total investment in corporate loans, debt securities and other investments | Ten issuers    
Concentration risk    
Concentration risk of total fair value (as a percent) 97.00% 89.00%