FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Determination of fair values
Number of primary sources of information used for determining fair value	1
Total number of primary sources of information available for determining fair value	3
Minimum percentage of the Company's fixed maturity securities priced by third party pricing services	90.00%
Number of independent non-binding broker quotes obtained per security	1
Percentage of derivatives excluding embedded derivatives that were priced using exchange prices or independent broker quotations	96.40%
Liabilities:
Fair value	$ 498,200,000	$ 457,802,000
Annuity account balances
Annuity account balances
Discount rate curve, base rate	LIBOR
Equity indexed annuities, discount rate for one month (as a percent)	0.27%
Equity indexed annuities, discount rate for five years (as a percent)	2.42%
Equity indexed annuities, discount rate for thirty years (as a percent)	4.54%
Level 3
Annuity account balances
Financial instruments that are valued using broker quotes	259,100,000	216,600,000
Financial instruments with book value approximating fair value	90,000,000	77,200,000
Level 3 | Annuity account balances
Liabilities:
Annuity account balances	105,593,000	107,000,000
Level 3 | Annuity account balances | Actuarial cash flow model
Unobservable input
Asset earned rate (as a percent)	5.37%	5.37%
Withdrawal rate (as a percent)	2.20%	2.20%
Level 3 | Annuity account balances | 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%
Expenses per Policy	88	88
Return on assets (as a percent)	1.50%	1.50%
Level 3 | Annuity account balances | 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)	1.00%	1.06%
Expenses per Policy	102	102
Return on assets (as a percent)	1.85%	1.85%
Asset-Backed Securities | Level 2
Determination of fair values
Carrying amount	3,300,000,000
Asset-Backed Securities | Level 3
Determination of fair values
Carrying amount	743,500,000
Other Asset-Backed Securities
Determination of fair values
Percentage of underlying collateral of student-loan backed auction rate securities guaranteed by the Federal Family Education Loan Program ("FFELP"), minimum	97.00%	97.00%
Other Asset-Backed Securities | Level 3
Determination of fair values
Carrying amount	548,805,000	545,808,000
Annuity account balances
Financial instruments that are valued using broker quotes	194,700,000	195,000,000
Other Asset-Backed Securities | Level 3 | Discounted cash flow | Minimum
Unobservable input
Liquidity premium (as a percent)	1.00%	1.00%
Paydown rate (as a percent)	8.57%	8.57%
Other Asset-Backed Securities | Level 3 | Discounted cash flow | Maximum
Unobservable input
Liquidity premium (as a percent)	1.57%	1.68%
Paydown rate (as a percent)	17.42%	16.87%
Other Asset-Backed Securities | Level 3 | Discounted cash flow | Weighted average
Unobservable input
Liquidity premium (as a percent)	1.13%	1.08%
Paydown rate (as a percent)	12.37%	12.05%
Other Asset-Backed Securities | Level 3 | Available-for-sale securities
Determination of fair values
Carrying amount	548,800,000
Percentage of underlying collateral of student-loan backed auction rate securities guaranteed by the Federal Family Education Loan Program ("FFELP"), minimum	97.00%
Other Asset-Backed Securities | Level 3 | Trading securities
Determination of fair values
Carrying amount	194,700,000
Corporate Bonds, U.S. Government-Related Securities, and Other Government Related Securities | Level 2
Determination of fair values
Carrying amount	29,000,000,000
Corporate Bonds, U.S. Government-Related Securities, and Other Government Related Securities | Level 3
Determination of fair values
Carrying amount	1,600,000,000
Embedded derivative - GMWB
Liabilities:
Fair value	2,600,000,000
Annuity account balances
Discount rate curve, base rate	LIBOR
Embedded derivative - GMWB | Minimum
Unobservable input
Mortality (as a percent)	49.00%
Embedded derivative - GMWB | Maximum
Unobservable input
Mortality (as a percent)	80.00%
Embedded derivative - GMWB | Trading securities
Determination of fair values
Carrying amount	2,900,000,000
Embedded derivative - GMWB | Level 3
Liabilities:
Fair value	73,983,000	156,287,000
Embedded derivative - GMWB | Level 3 | Actuarial cash flow model | Minimum
Unobservable input
Mortality (as a percent)	49.00%	49.00%
Lapse (as a percent)	0.00%	0.00%
Utilization (as a percent)	97.00%	97.00%
Nonperformance risk (as a percent)	0.12%	0.15%
Embedded derivative - GMWB | Level 3 | Actuarial cash flow model | Maximum
Unobservable input
Mortality (as a percent)	80.00%	80.00%
Lapse (as a percent)	24.00%	24.00%
Utilization (as a percent)	103.00%	103.00%
Nonperformance risk (as a percent)	1.00%	1.06%
Equity securities | Level 3
Annuity account balances
Financial instruments that are valued using broker quotes	10,400,000	600,000
Financial instruments with book value approximating fair value	71,100,000	71,300,000
Equity securities | Level 2 and Level 3
Determination of fair values
Carrying amount	167,300,000
Federal Home Loan Bank Stock	67,100,000
Corporate Bonds | Level 3
Determination of fair values
Carrying amount	1,535,409,000	1,555,898,000
Annuity account balances
Financial instruments that are valued using broker quotes	54,000,000	21,000,000
Financial instruments with book value approximating fair value	15,200,000	2,200,000
Corporate Bonds | Level 3 | Discounted cash flow | Minimum
Unobservable input
Spread over treasury (as a percent)	0.70%	0.11%
Corporate Bonds | Level 3 | Discounted cash flow | Maximum
Unobservable input
Spread over treasury (as a percent)	6.75%	6.75%
Corporate Bonds | Level 3 | Discounted cash flow | Weighted average
Unobservable input
Spread over treasury (as a percent)	2.10%	2.06%
Fixed maturity securities | Level 3
Annuity account balances
Financial instruments with book value approximating fair value	3,700,000	3,700,000
Embedded derivative - FIA | Minimum
Unobservable input
Mortality (as a percent)	49.00%
Embedded derivative - FIA | Maximum
Unobservable input
Mortality (as a percent)	80.00%
Embedded derivative - FIA | Level 3
Liabilities:
Fair value	35,894,000	25,324,000
Embedded derivative - FIA | Level 3 | 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%
Embedded derivative - FIA | Level 3 | 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)	1.00%	1.06%
Expenses per Policy	$ 97	$ 97
Withdrawal rate (as a percent)	4.50%	4.50%