ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details 2) - USD ($)	1 Months Ended	2 Months Ended	3 Months Ended
	Jan. 31, 2015	Mar. 31, 2015	Mar. 31, 2016
Successor
Reclassifications out of accumulated other comprehensive income (loss)
Benefits and settlement expenses, net of reinsurance ceded		$ (486,299,000)	$ (714,545,000)
Realized investment gains (losses): All other investments		(35,056,000)	81,728,000
Net impairment losses recognized in earnings		0	(2,617,000)
Income before income tax		92,827,000	171,842,000
Tax benefit (expense)		(29,966,000)	(56,494,000)
Net income		62,861,000	115,348,000
Successor | Gains and losses on derivative instruments | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Reclassifications out of accumulated other comprehensive income (loss)
Benefits and settlement expenses, net of reinsurance ceded		(90,000)
Income before income tax		(90,000)
Tax benefit (expense)		31,000
Net income		(59,000)
Successor | Unrealized gains and losses on available-for-sale securities | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Reclassifications out of accumulated other comprehensive income (loss)
Realized investment gains (losses): All other investments		373,000	5,555,000
Net impairment losses recognized in earnings		0	(2,617,000)
Income before income tax		373,000	2,938,000
Tax benefit (expense)		(131,000)	(1,028,000)
Net income		$ 242,000	$ 1,910,000
Predecessor
Reclassifications out of accumulated other comprehensive income (loss)
Benefits and settlement expenses, net of reinsurance ceded	$ (267,287,000)
Realized investment gains (losses): All other investments	81,153,000
Net impairment losses recognized in earnings	(481,000)
Income before income tax	1,182,000
Tax benefit (expense)	327,000
Net income	1,509,000
Predecessor | Gains and losses on derivative instruments | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Reclassifications out of accumulated other comprehensive income (loss)
Benefits and settlement expenses, net of reinsurance ceded	(36,000)
Income before income tax	(36,000)
Tax benefit (expense)	13,000
Net income	(23,000)
Predecessor | Unrealized gains and losses on available-for-sale securities | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Reclassifications out of accumulated other comprehensive income (loss)
Realized investment gains (losses): All other investments	6,891,000
Net impairment losses recognized in earnings	(481,000)
Income before income tax	6,410,000
Tax benefit (expense)	(2,244,000)
Net income	4,166,000
Predecessor | Minimum Pension Liability Adjustment
Reclassifications out of accumulated other comprehensive income (loss)
Total before tax	(772,000)
Tax (expense) or benefit	270,000
Net of tax	(502,000)
Predecessor | Amortization of net actuarial gain/(loss) | Other Operating Expenses
Reclassifications out of accumulated other comprehensive income (loss)
Total before tax	(808,000)
Predecessor | Amortization of prior service credit/(cost) | Other Operating Expenses
Reclassifications out of accumulated other comprehensive income (loss)
Total before tax	31,000
Predecessor | Amortization of transition asset/(obligation) | Other Operating Expenses
Reclassifications out of accumulated other comprehensive income (loss)
Total before tax	$ 5,000