INVESTMENT OPERATIONS - Schedule of Available-for-Sale Credit Losses on Fixed Maturities Held by the Company for Which a Portion of Other-than-Temporary Impairments were Recognized in Other Comprehensive Income (Loss) (Details) - Fixed maturities - 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]
Beginning balance		$ 2,619	$ 0	$ 0	$ 22,761
Additions for newly impaired securities		964	4,472	4,472	3,056
Additions for previously impaired securities		0	0	0	525
Reductions for previously impaired securities due to a change in expected cash flows		0	0	0	(22,759)
Reductions for previously impaired securities that were sold in the current period		(2,619)	0	0	(2,619)
Ending balance	$ 0	$ 964	$ 4,472	4,472	$ 964
Predecessor
Investment [Line Items]
Beginning balance	15,463			$ 15,684
Additions for newly impaired securities	0
Additions for previously impaired securities	221
Reductions for previously impaired securities due to a change in expected cash flows	0
Reductions for previously impaired securities that were sold in the current period	0
Ending balance	$ 15,684