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INVESTMENT OPERATIONS - Schedule of Gross Realized Gains (Losses) on Investments Available-for-Sale (Details) - USD ($)
$ in Thousands
1 Months Ended 11 Months Ended 12 Months Ended
Jan. 31, 2015
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2014
Successor        
Investment [Line Items]        
Gross realized gains   $ 8,745 $ 42,085  
Gross realized losses   (35,456) (27,531)  
Impairments losses included in gross realized losses   $ (26,993) $ (17,748)  
Predecessor        
Investment [Line Items]        
Gross realized gains $ 6,920     $ 78,120
Gross realized losses (469)     (8,067)
Impairments losses included in gross realized losses $ (481)     $ (7,275)