FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Unobservable Input
Fixed maturities, held-to-maturity	435,000,000	365,000,000
Level 3
Unobservable Input
Financial instruments that are valued using broker quotes	237,200,000	216,000,000
Financial instruments with book value approximating to fair value	70,400,000	73,900,000
Level 3 | Other asset-backed securities
Valuation of Level 3 Financial Instruments
Fair Value of Assets	563,752,000	545,808,000
Unobservable Input
Financial instruments that are valued using broker quotes	169,700,000	195,000,000
Level 3 | Equity securities
Unobservable Input
Financial instruments with book value approximating to fair value	66,700,000	68,000,000
Level 3 | Other fixed maturity securities
Unobservable Input
Financial instruments with book value approximating to fair value	3,700,000	3,700,000
Level 3 | Discounted cash flow | Other asset-backed securities | Minimum
Unobservable Input
Liquidity premium (as a percent)	0.39%	1.00%
Paydown rate (as a percent)	9.70%	8.57%
Level 3 | Discounted cash flow | Other asset-backed securities | Maximum
Unobservable Input
Liquidity premium (as a percent)	1.49%	1.68%
Paydown rate (as a percent)	15.80%	16.87%
Level 3 | Discounted cash flow | Other asset-backed securities | Weighted Average
Unobservable Input
Liquidity premium (as a percent)	0.69%	1.08%
Paydown rate (as a percent)	12.08%	12.05%
Level 3 | Embedded derivative - GMWB
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities	25,927,000
Level 3 | 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%
Level 3 | 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%
Level 3 | Annuity account
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities	97,825,000	107,000,000
Level 3 | Annuity account | Actuarial cash flow model
Unobservable Input
Asset earned rate (as a percent)		5.37%
Withdrawal rate (as a percent)	2.20%	2.20%
Level 3 | Annuity account | Actuarial cash flow model | Minimum
Unobservable Input
Mortality (as a percent)	49.00%	49.00%
Lapse (as a percent)	2.20%	2.20%
Nonperformance risk (as a percent)	0.12%	0.15%
Asset earned rate (as a percent)	3.86%
Expenses per policy	88	88
Return on assets (as a percent)	1.50%	1.50%
Level 3 | Annuity account | Actuarial cash flow model | Maximum
Unobservable Input
Mortality (as a percent)	80.00%	80.00%
Lapse (as a percent)	33.00%	33.00%
Nonperformance risk (as a percent)	0.96%	1.06%
Asset earned rate (as a percent)	5.92%
Expenses per policy	102	102
Return on assets (as a percent)	1.85%	1.85%
Level 3 | Embedded derivative - FIA
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities	124,465,000	25,324,000
Level 3 | Embedded derivative - FIA | Actuarial cash flow model | Minimum
Unobservable Input
Mortality (as a percent)	49.00%	49.00%
Lapse (as a percent)	2.50%	2.50%
Nonperformance risk (as a percent)	0.12%	0.15%
Expenses per policy	83	83
Withdrawal rate (as a percent)	1.10%	1.10%
Level 3 | Embedded derivative - FIA | Actuarial cash flow model | Maximum
Unobservable Input
Mortality (as a percent)	80.00%	80.00%
Lapse (as a percent)	40.00%	40.00%
Nonperformance risk (as a percent)	0.96%	1.06%
Expenses per policy	97	97
Withdrawal rate (as a percent)	4.50%	4.50%
Level 3 | Embedded derivative - IUL
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities	6,691,000
Level 3 | 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%
Level 3 | 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%
Level 3 | Corporate bonds
Valuation of Level 3 Financial Instruments
Fair Value of Assets	1,282,864,000	1,555,898,000
Unobservable Input
Financial instruments that are valued using broker quotes	67,500,000	21,000,000
Financial instruments with book value approximating to fair value		2,200,000
Level 3 | Corporate bonds | Discounted cash flow | Minimum
Unobservable Input
Spread over treasury (as a percent)	0.33%	0.11%
Level 3 | Corporate bonds | Discounted cash flow | Maximum
Unobservable Input
Spread over treasury (as a percent)	7.50%	6.75%
Level 3 | Corporate bonds | Discounted cash flow | Weighted Average
Unobservable Input
Spread over treasury (as a percent)	2.19%	2.06%
Level 3 | Embedded derivative - GMWB
Valuation of Level 3 Financial Instruments
Fair Value of Assets		93,939,000
Level 3 | Embedded derivative - GMWB | Actuarial cash flow model | Minimum
Unobservable Input
Mortality (as a percent)		49.00%
Lapse (as a percent)		0.00%
Utilization (as a percent)		97.00%
Nonperformance risk (as a percent)		0.15%
Level 3 | Embedded derivative - GMWB | Actuarial cash flow model | Maximum
Unobservable Input
Mortality (as a percent)		80.00%
Lapse (as a percent)		24.00%
Utilization (as a percent)		103.00%
Nonperformance risk (as a percent)		1.06%