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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 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]          
Gross realized gains   $ 3,223 $ 714 $ 7,646 $ 31,004
Gross realized losses   (4,866) (12,031) (20,974) (13,763)
Impairments losses included in gross realized losses   $ (3,308) $ (10,064) $ (15,798) $ (6,892)
Predecessor          
Investment [Line Items]          
Gross realized gains $ 6,920        
Gross realized losses (469)        
Impairments losses included in gross realized losses $ (481)