FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets:
Available-for-sale securities	$ 26,515,260	$ 27,214,682
Trading securities	2,900,000
Total fixed maturity securities	28,904,876	29,769,978
Equity securities	405,855	373,715
Other long-term investments	175,921	130,428
Short-term investments	171,010	216,787
Assets related to separate accounts
Variable annuity	11,162,856	9,601,417
Variable universal life	620,429	562,817
Liabilities:
Other liabilities	444,708	657,874
Fixed maturities
Assets:
Available-for-sale securities	26,052,343	26,762,670
Residential mortgage-backed securities
Assets:
Available-for-sale securities	1,572,239	1,839,330
Commercial mortgage-backed securities
Assets:
Available-for-sale securities	942,804	869,823
Other asset-backed securities
Assets:
Available-for-sale securities	922,912	975,013
U.S. government-related securities
Assets:
Available-for-sale securities	1,176,167	1,168,446
States, municipals, and political subdivisions
Assets:
Available-for-sale securities	1,337,690	1,443,653
Other government-related securities
Assets:
Available-for-sale securities	65,685	100,778
Corporate bonds
Assets:
Available-for-sale securities	20,034,846	20,365,627
Measured at fair value on a recurring basis \| Level 1
Assets:
Total fixed maturity securities	1,232,613	1,214,899
Equity securities	305,309	273,072
Other long-term investments	69,584	23,639
Short-term investments	161,989	214,295
Total investments	1,769,495	1,725,905
Cash	130,860	269,582
Assets related to separate accounts
Variable annuity	11,162,856	9,601,417
Variable universal life	620,429	562,817
Total assets	13,683,640	12,159,721
Liabilities:
Other liabilities	5,482	19,187
Total liabilities	5,482	19,187
Measured at fair value on a recurring basis \| Level 1 \| Fixed maturities
Assets:
Available-for-sale securities	1,027,828	910,195
Trading securities	204,785	304,704
Measured at fair value on a recurring basis \| Level 1 \| U.S. government-related securities
Assets:
Available-for-sale securities	1,027,622	909,988
Trading securities	204,785	304,704
Measured at fair value on a recurring basis \| Level 1 \| Corporate bonds
Assets:
Available-for-sale securities	206	207
Measured at fair value on a recurring basis \| Level 2
Assets:
Total fixed maturity securities	26,683,610	27,696,104
Equity securities	35,019	35,116
Other long-term investments	58,499	58,134
Short-term investments	9,021	2,492
Total investments	26,786,149	27,791,846
Assets related to separate accounts
Total assets	26,786,149	27,791,846
Liabilities:
Other liabilities	182,450	27,250
Total liabilities	182,450	27,250
Measured at fair value on a recurring basis \| Level 2 \| Fixed maturities
Assets:
Available-for-sale securities	24,214,887	25,064,150
Trading securities	2,468,723	2,631,954
Measured at fair value on a recurring basis \| Level 2 \| Residential mortgage-backed securities
Assets:
Available-for-sale securities	1,558,177	1,839,326
Trading securities	333,246	357,803
Measured at fair value on a recurring basis \| Level 2 \| Commercial mortgage-backed securities
Assets:
Available-for-sale securities	942,804	869,823
Trading securities	171,011	171,073
Measured at fair value on a recurring basis \| Level 2 \| Other asset-backed securities
Assets:
Available-for-sale securities	346,516	378,870
Trading securities	89,622	87,395
Measured at fair value on a recurring basis \| Level 2 \| U.S. government-related securities
Assets:
Available-for-sale securities	148,545	258,458
Trading securities	1,581	1,169
Measured at fair value on a recurring basis \| Level 2 \| States, municipals, and political subdivisions
Assets:
Available-for-sale securities	1,333,415	1,439,378
Trading securities	263,675	278,898
Measured at fair value on a recurring basis \| Level 2 \| Other government-related securities
Assets:
Available-for-sale securities	45,685	80,767
Trading securities	57,155	63,444
Measured at fair value on a recurring basis \| Level 2 \| Corporate bonds
Assets:
Available-for-sale securities	19,839,745	20,197,528
Trading securities	1,552,433	1,672,172
Measured at fair value on a recurring basis \| Level 3
Assets:
Total fixed maturity securities	988,653	858,975
Equity securities	65,527	65,527
Other long-term investments	47,838	48,655
Total investments	1,102,018	973,157
Assets related to separate accounts
Total assets	1,102,018	973,157
Liabilities:
Annuity account balances	114,614	129,468
Other liabilities	256,776	611,437
Total liabilities	371,390	740,905
Measured at fair value on a recurring basis \| Level 3 \| Fixed maturities
Assets:
Available-for-sale securities	809,628	788,325
Trading securities	179,025	70,650
Measured at fair value on a recurring basis \| Level 3 \| Residential mortgage-backed securities
Assets:
Available-for-sale securities	14,062	4
Trading securities	1,582
Measured at fair value on a recurring basis \| Level 3 \| Other asset-backed securities
Assets:
Available-for-sale securities	576,396	596,143
Trading securities	168,851	70,535
Measured at fair value on a recurring basis \| Level 3 \| States, municipals, and political subdivisions
Assets:
Available-for-sale securities	4,275	4,275
Trading securities	3,500
Measured at fair value on a recurring basis \| Level 3 \| Other government-related securities
Assets:
Available-for-sale securities	20,000	20,011
Measured at fair value on a recurring basis \| Level 3 \| Corporate bonds
Assets:
Available-for-sale securities	194,895	167,892
Trading securities	5,092	115
Measured at fair value on a recurring basis \| Total
Assets:
Total fixed maturity securities	28,904,876	29,769,978
Equity securities	405,855	373,715
Other long-term investments	175,921	130,428
Short-term investments	171,010	216,787
Total investments	29,657,662	30,490,908
Cash	130,860	269,582
Assets related to separate accounts
Variable annuity	11,162,856	9,601,417
Variable universal life	620,429	562,817
Total assets	41,571,807	40,924,724
Liabilities:
Annuity account balances	114,614	129,468
Other liabilities	444,708	657,874
Total liabilities	559,322	787,342
Measured at fair value on a recurring basis \| Total \| Fixed maturities
Assets:
Available-for-sale securities	26,052,343	26,762,670
Trading securities	2,852,533	3,007,308
Measured at fair value on a recurring basis \| Total \| Residential mortgage-backed securities
Assets:
Available-for-sale securities	1,572,239	1,839,330
Trading securities	334,828	357,803
Measured at fair value on a recurring basis \| Total \| Commercial mortgage-backed securities
Assets:
Available-for-sale securities	942,804	869,823
Trading securities	171,011	171,073
Measured at fair value on a recurring basis \| Total \| Other asset-backed securities
Assets:
Available-for-sale securities	922,912	975,013
Trading securities	258,473	157,930
Measured at fair value on a recurring basis \| Total \| U.S. government-related securities
Assets:
Available-for-sale securities	1,176,167	1,168,446
Trading securities	206,366	305,873
Measured at fair value on a recurring basis \| Total \| States, municipals, and political subdivisions
Assets:
Available-for-sale securities	1,337,690	1,443,653
Trading securities	267,175	278,898
Measured at fair value on a recurring basis \| Total \| Other government-related securities
Assets:
Available-for-sale securities	65,685	100,778
Trading securities	57,155	63,444
Measured at fair value on a recurring basis \| Total \| Corporate bonds
Assets:
Available-for-sale securities	20,034,846	20,365,627
Trading securities	$ 1,557,525	$ 1,672,287

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