INVESTMENT OPERATIONS - Summary of Net Realized Investment Gains (Losses) for All Other Investments (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]
Fixed maturities		$ 1,665	$ (1,304)	$ 2,398	$ 24,097
Equity securities		0	51	72	36
Impairments on fixed maturity securities		(3,308)	(10,064)	(15,798)	(6,892)
Modco trading portfolio		23,995	8,377	(133,524)	178,353
Other investments		(1,508)	(1,815)	(1,040)	(7,842)
Total realized gains (losses) - investments		$ 20,844	$ (4,755)	$ (147,892)	$ 187,752
Predecessor
Investment [Line Items]
Fixed maturities	$ 6,891
Equity securities	0
Impairments on fixed maturity securities	(481)
Modco trading portfolio	73,062
Other investments	1,200
Total realized gains (losses) - investments	$ 80,672