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INVESTMENT OPERATIONS - Schedule of Fair Value (Proceeds) and Gains/Losses Realized on Securities Sold in an Unrealized Gain/Loss Position (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended
Jan. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2016
Successor          
Investment [Line Items]          
Fair value (proceeds) of securities in an unrealized gain position sold   $ 167,272 $ 94,825 $ 809,863 $ 990,066
Gain realized on the sale of securities in an unrealized gain position   3,223 715 7,656 31,023
Fair value (proceeds) of securities in an unrealized loss position sold   7,105 34,591 83,917 67,688
Loss realized on the sale of securities in an unrealized loss position   $ (1,558) $ (1,967) $ (5,175) $ (6,871)
Predecessor          
Investment [Line Items]          
Fair value (proceeds) of securities in an unrealized gain position sold $ 172,551        
Gain realized on the sale of securities in an unrealized gain position 6,920        
Fair value (proceeds) of securities in an unrealized loss position sold 435        
Loss realized on the sale of securities in an unrealized loss position $ (29)