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)	$ 2,408	$ 24,116
Equity securities		0	51	72	36
Impairments on corporate securities		(3,308)	(10,064)	(15,798)	(6,892)
Modco trading portfolio		23,995	8,377	(133,524)	178,353
Other investments		(1,508)	(1,776)	(1,001)	(7,842)
Total realized gains (losses) - investments		$ 20,844	$ (4,716)	$ (147,843)	$ 187,771
Predecessor
Investment [Line Items]
Fixed maturities	$ 6,891
Equity securities	0
Impairments on corporate securities	(481)
Modco trading portfolio	73,062
Other investments	1,200
Total realized gains (losses) - investments	$ 80,672