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INVESTMENT OPERATIONS - Schedule of Gross Realized Gains and Losses on Available-for-Sale Investments (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
Predecessor        
Schedule of Available-for-sale Securities [Line Items]        
Gross realized gains $ 6,920     $ 76,737
Gross realized losses (469)     (8,443)
Impairments losses included in gross realized losses $ (481)     $ (7,275)
Successor        
Schedule of Available-for-sale Securities [Line Items]        
Gross realized gains   $ 8,735 $ 42,058  
Gross realized losses   (35,457) (27,531)  
Impairments losses included in gross realized losses   $ (26,993) $ (17,748)