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	2 Months Ended	3 Months Ended
	Jan. 31, 2015	Mar. 31, 2015	Mar. 31, 2016
Successor
Investment [Line Items]
Beginning balance		$ 0	$ 22,761
Additions for newly impaired securities		0	2,092
Additions for previously impaired securities		0	525
Reductions for previously impaired securities due to a change in expected cash flows		0	(22,759)
Reductions for previously impaired securities that were sold in the current period		0	0
Ending balance	$ 0	0	$ 2,619
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