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INVESTMENT OPERATIONS - Schedule of Gross Realized Gains (Losses) on Investments Available-for-Sale (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended
Jan. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2016
Successor          
Investment [Line Items]          
Gross realized gains   $ 18,752 $ 5,425 $ 6,932 $ 27,781
Gross realized losses   (2,784) (7,809) (8,943) (8,894)
Impairments losses included in gross realized losses   $ (964) $ (5,734) $ (5,734) $ (3,581)
Predecessor          
Investment [Line Items]          
Gross realized gains $ 6,920        
Gross realized losses (469)        
Impairments losses included in gross realized losses $ 0