FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 3) - Level 3 - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Unobservable Input
Financial instruments that are valued using broker quotes	$ 199,800,000
Financial instruments with book value approximating to fair value	66,500,000
Other asset-backed securities
Valuation of Level 3 Financial Instruments
Fair Value of Assets	585,751,000
Unobservable Input
Financial instruments that are valued using broker quotes	$ 155,200,000
Discounted cash flow | Other asset-backed securities | Minimum
Unobservable Input
Liquidity premium (as a percent)	0.43%
Paydown rate (as a percent)	9.85%
Discounted cash flow | Other asset-backed securities | Maximum
Unobservable Input
Liquidity premium (as a percent)	1.49%
Paydown rate (as a percent)	15.41%
Discounted cash flow | Other asset-backed securities | Weighted Average
Unobservable Input
Liquidity premium (as a percent)	0.70%
Paydown rate (as a percent)	13.17%
Embedded derivative - GMWB
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities	$ 14,454,000
Annuity account
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities	95,198,000
Annuity account | Actuarial cash flow model
Unobservable Input
Expenses per policy	$ 81
Withdrawal rate (as a percent)	2.20%
Annuity account | Actuarial cash flow model | Minimum
Unobservable Input
Lapse (as a percent)	2.20%
Nonperformance risk (as a percent)	0.21%
Asset earned rate (as a percent)	4.53%
Return on assets (as a percent)	1.50%
Annuity account | Actuarial cash flow model | Maximum
Unobservable Input
Lapse (as a percent)	33.00%
Nonperformance risk (as a percent)	1.17%
Asset earned rate (as a percent)	5.67%
Return on assets (as a percent)	1.85%
Embedded derivative - FIA
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities	$ 76,709,000
Embedded derivative - FIA | Actuarial cash flow model
Unobservable Input
Expenses per policy	$ 81.5
Embedded derivative - FIA | Actuarial cash flow model | Minimum
Unobservable Input
Lapse (as a percent)	2.50%
Nonperformance risk (as a percent)	0.21%
Withdrawal rate (as a percent)	1.10%
Embedded derivative - FIA | Actuarial cash flow model | Maximum
Unobservable Input
Lapse (as a percent)	40.00%
Nonperformance risk (as a percent)	1.17%
Withdrawal rate (as a percent)	4.50%
Embedded derivative - IUL
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities	$ 21,711,000
Embedded derivative - IUL | Actuarial cash flow model | Minimum
Unobservable Input
Mortality (as a percent)	38.00%
Lapse (as a percent)	0.50%
Nonperformance risk (as a percent)	0.21%
Embedded derivative - IUL | Actuarial cash flow model | Maximum
Unobservable Input
Mortality (as a percent)	153.00%
Lapse (as a percent)	10.00%
Nonperformance risk (as a percent)	1.17%
Corporate securities
Valuation of Level 3 Financial Instruments
Fair Value of Assets	$ 1,022,464,000
Unobservable Input
Financial instruments that are valued using broker quotes	$ 44,600,000
Corporate securities | Discounted cash flow | Minimum
Unobservable Input
Spread over treasury (as a percent)	0.74%
Corporate securities | Discounted cash flow | Maximum
Unobservable Input
Spread over treasury (as a percent)	12.18%
Corporate securities | Discounted cash flow | Weighted Average
Unobservable Input
Spread over treasury (as a percent)	2.45%
Embedded derivative - GMWB | Actuarial cash flow model
Unobservable Input
Utilization (as a percent)	99.00%
Policies that have a one-time over-utilization rate of a specified amount (as a percent)	10.00%
Specified level of one-time over-utilization (as a percent)	400.00%
Embedded derivative - GMWB | Actuarial cash flow model | Minimum
Unobservable Input
Lapse (as a percent)	0.30%
Nonperformance risk (as a percent)	0.21%
Embedded derivative - GMWB | Actuarial cash flow model | Maximum
Unobservable Input
Lapse (as a percent)	15.00%
Nonperformance risk (as a percent)	1.17%
Predecessor
Unobservable Input
Financial instruments that are valued using broker quotes		$ 237,200,000
Financial instruments with book value approximating to fair value		70,400,000
Predecessor | Other asset-backed securities
Valuation of Level 3 Financial Instruments
Fair Value of Assets		563,752,000
Unobservable Input
Financial instruments that are valued using broker quotes		169,700,000
Predecessor | Equity securities
Unobservable Input
Financial instruments with book value approximating to fair value		66,700,000
Predecessor | Fixed maturities
Unobservable Input
Financial instruments with book value approximating to fair value		$ 3,700,000
Predecessor | Discounted cash flow | Other asset-backed securities | Minimum
Unobservable Input
Liquidity premium (as a percent)		0.39%
Paydown rate (as a percent)		9.70%
Predecessor | Discounted cash flow | Other asset-backed securities | Maximum
Unobservable Input
Liquidity premium (as a percent)		1.49%
Paydown rate (as a percent)		15.80%
Predecessor | Discounted cash flow | Other asset-backed securities | Weighted Average
Unobservable Input
Liquidity premium (as a percent)		0.69%
Paydown rate (as a percent)		12.08%
Predecessor | Embedded derivative - GMWB
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities		$ 25,927,000
Predecessor | Embedded derivative - GMWB | Actuarial cash flow model | Minimum
Unobservable Input
Mortality (as a percent)		44.50%
Lapse (as a percent)		0.25%
Utilization (as a percent)		97.00%
Nonperformance risk (as a percent)		0.12%
Predecessor | Embedded derivative - GMWB | Actuarial cash flow model | Maximum
Unobservable Input
Mortality (as a percent)		100.00%
Lapse (as a percent)		17.00%
Utilization (as a percent)		101.00%
Nonperformance risk (as a percent)		0.96%
Predecessor | Annuity account
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities		$ 97,825,000
Predecessor | Annuity account | Actuarial cash flow model
Unobservable Input
Withdrawal rate (as a percent)		2.20%
Predecessor | Annuity account | Actuarial cash flow model | Minimum
Unobservable Input
Mortality (as a percent)		49.00%
Lapse (as a percent)		2.20%
Nonperformance risk (as a percent)		0.12%
Asset earned rate (as a percent)		3.86%
Expenses per policy		$ 88
Return on assets (as a percent)		1.50%
Predecessor | Annuity account | Actuarial cash flow model | Maximum
Unobservable Input
Mortality (as a percent)		80.00%
Lapse (as a percent)		33.00%
Nonperformance risk (as a percent)		0.96%
Asset earned rate (as a percent)		5.92%
Expenses per policy		$ 102
Return on assets (as a percent)		1.85%
Predecessor | Embedded derivative - FIA
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities		$ 124,465,000
Predecessor | Embedded derivative - FIA | Actuarial cash flow model | Minimum
Unobservable Input
Mortality (as a percent)		49.00%
Lapse (as a percent)		2.50%
Nonperformance risk (as a percent)		0.12%
Expenses per policy		$ 83
Withdrawal rate (as a percent)		1.10%
Predecessor | Embedded derivative - FIA | Actuarial cash flow model | Maximum
Unobservable Input
Mortality (as a percent)		80.00%
Lapse (as a percent)		40.00%
Nonperformance risk (as a percent)		0.96%
Expenses per policy		$ 97
Withdrawal rate (as a percent)		4.50%
Predecessor | Embedded derivative - IUL
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities		$ 6,691,000
Predecessor | Embedded derivative - IUL | Actuarial cash flow model | Minimum
Unobservable Input
Mortality (as a percent)		37.00%
Lapse (as a percent)		0.50%
Nonperformance risk (as a percent)		0.12%
Predecessor | Embedded derivative - IUL | Actuarial cash flow model | Maximum
Unobservable Input
Mortality (as a percent)		74.00%
Lapse (as a percent)		10.00%
Nonperformance risk (as a percent)		0.96%
Predecessor | Corporate securities
Valuation of Level 3 Financial Instruments
Fair Value of Assets		$ 1,282,864,000
Unobservable Input
Financial instruments that are valued using broker quotes		$ 67,500,000
Predecessor | Corporate securities | Discounted cash flow | Minimum
Unobservable Input
Spread over treasury (as a percent)		0.33%
Predecessor | Corporate securities | Discounted cash flow | Maximum
Unobservable Input
Spread over treasury (as a percent)		7.50%
Predecessor | Corporate securities | Discounted cash flow | Weighted Average
Unobservable Input
Spread over treasury (as a percent)		2.19%