FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets:
Available-for-sale securities	$ 27,482,932	$ 27,214,682
Trading securities	3,100,000
Total fixed maturity securities	30,047,749	29,769,978
Equity securities	376,117	373,715
Other long-term investments	152,882	130,428
Short-term investments	160,301	216,787
Assets related to separate accounts
Variable annuity	10,670,833	9,601,417
Variable universal life	605,622	562,817
Liabilities:
Other liabilities	589,561	657,874
Fixed maturities
Assets:
Available-for-sale securities	27,079,561	26,762,670
Residential mortgage-backed securities
Assets:
Available-for-sale securities	1,717,910	1,839,330
Commercial mortgage-backed securities
Assets:
Available-for-sale securities	916,155	869,823
Other asset-backed securities
Assets:
Available-for-sale securities	946,561	975,013
U.S. government-related securities
Assets:
Available-for-sale securities	1,207,052	1,168,446
States, municipals, and political subdivisions
Assets:
Available-for-sale securities	1,433,521	1,443,653
Other government-related securities
Assets:
Available-for-sale securities	88,477	100,778
Corporate bonds
Assets:
Available-for-sale securities	20,769,885	20,365,627
Measured at fair value on a recurring basis \| Level 1
Assets:
Total fixed maturity securities	1,283,889	1,214,899
Equity securities	273,488	273,072
Other long-term investments	39,960	23,639
Short-term investments	156,825	214,295
Total investments	1,754,162	1,725,905
Cash	171,443	269,582
Assets related to separate accounts
Variable annuity	10,670,833	9,601,417
Variable universal life	605,622	562,817
Total assets	13,202,060	12,159,721
Liabilities:
Other liabilities	2,380	19,187
Total liabilities	2,380	19,187
Measured at fair value on a recurring basis \| Level 1 \| Fixed maturities
Assets:
Available-for-sale securities	988,881	910,195
Trading securities	295,008	304,704
Measured at fair value on a recurring basis \| Level 1 \| U.S. government-related securities
Assets:
Available-for-sale securities	988,675	909,988
Trading securities	295,008	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	27,977,860	27,696,104
Equity securities	37,102	35,116
Other long-term investments	42,518	58,134
Short-term investments	3,476	2,492
Total investments	28,060,956	27,791,846
Assets related to separate accounts
Total assets	28,060,956	27,791,846
Liabilities:
Other liabilities	47,367	27,250
Total liabilities	47,367	27,250
Measured at fair value on a recurring basis \| Level 2 \| Fixed maturities
Assets:
Available-for-sale securities	25,381,175	25,064,150
Trading securities	2,596,685	2,631,954
Measured at fair value on a recurring basis \| Level 2 \| Residential mortgage-backed securities
Assets:
Available-for-sale securities	1,717,906	1,839,326
Trading securities	354,522	357,803
Measured at fair value on a recurring basis \| Level 2 \| Commercial mortgage-backed securities
Assets:
Available-for-sale securities	916,155	869,823
Trading securities	176,986	171,073
Measured at fair value on a recurring basis \| Level 2 \| Other asset-backed securities
Assets:
Available-for-sale securities	385,893	378,870
Trading securities	91,039	87,395
Measured at fair value on a recurring basis \| Level 2 \| U.S. government-related securities
Assets:
Available-for-sale securities	218,377	258,458
Trading securities	1,728	1,169
Measured at fair value on a recurring basis \| Level 2 \| States, municipals, and political subdivisions
Assets:
Available-for-sale securities	1,429,246	1,439,378
Trading securities	283,842	278,898
Measured at fair value on a recurring basis \| Level 2 \| Other government-related securities
Assets:
Available-for-sale securities	68,474	80,767
Trading securities	63,728	63,444
Measured at fair value on a recurring basis \| Level 2 \| Corporate bonds
Assets:
Available-for-sale securities	20,645,124	20,197,528
Trading securities	1,624,840	1,672,172
Measured at fair value on a recurring basis \| Level 3
Assets:
Total fixed maturity securities	786,000	858,975
Equity securities	65,527	65,527
Other long-term investments	70,404	48,655
Total investments	921,931	973,157
Assets related to separate accounts
Total assets	921,931	973,157
Liabilities:
Annuity account balances	123,681	129,468
Other liabilities	539,814	611,437
Total liabilities	663,495	740,905
Measured at fair value on a recurring basis \| Level 3 \| Fixed maturities
Assets:
Available-for-sale securities	709,505	788,325
Trading securities	76,495	70,650
Measured at fair value on a recurring basis \| Level 3 \| Residential mortgage-backed securities
Assets:
Available-for-sale securities	4	4
Measured at fair value on a recurring basis \| Level 3 \| Other asset-backed securities
Assets:
Available-for-sale securities	560,668	596,143
Trading securities	71,383	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
Measured at fair value on a recurring basis \| Level 3 \| Other government-related securities
Assets:
Available-for-sale securities	20,003	20,011
Measured at fair value on a recurring basis \| Level 3 \| Corporate bonds
Assets:
Available-for-sale securities	124,555	167,892
Trading securities	5,112	115
Measured at fair value on a recurring basis \| Total
Assets:
Total fixed maturity securities	30,047,749	29,769,978
Equity securities	376,117	373,715
Other long-term investments	152,882	130,428
Short-term investments	160,301	216,787
Total investments	30,737,049	30,490,908
Cash	171,443	269,582
Assets related to separate accounts
Variable annuity	10,670,833	9,601,417
Variable universal life	605,622	562,817
Total assets	42,184,947	40,924,724
Liabilities:
Annuity account balances	123,681	129,468
Other liabilities	589,561	657,874
Total liabilities	713,242	787,342
Measured at fair value on a recurring basis \| Total \| Fixed maturities
Assets:
Available-for-sale securities	27,079,561	26,762,670
Trading securities	2,968,188	3,007,308
Measured at fair value on a recurring basis \| Total \| Residential mortgage-backed securities
Assets:
Available-for-sale securities	1,717,910	1,839,330
Trading securities	354,522	357,803
Measured at fair value on a recurring basis \| Total \| Commercial mortgage-backed securities
Assets:
Available-for-sale securities	916,155	869,823
Trading securities	176,986	171,073
Measured at fair value on a recurring basis \| Total \| Other asset-backed securities
Assets:
Available-for-sale securities	946,561	975,013
Trading securities	162,422	157,930
Measured at fair value on a recurring basis \| Total \| U.S. government-related securities
Assets:
Available-for-sale securities	1,207,052	1,168,446
Trading securities	296,736	305,873
Measured at fair value on a recurring basis \| Total \| States, municipals, and political subdivisions
Assets:
Available-for-sale securities	1,433,521	1,443,653
Trading securities	283,842	278,898
Measured at fair value on a recurring basis \| Total \| Other government-related securities
Assets:
Available-for-sale securities	88,477	100,778
Trading securities	63,728	63,444
Measured at fair value on a recurring basis \| Total \| Corporate bonds
Assets:
Available-for-sale securities	20,769,885	20,365,627
Trading securities	$ 1,629,952	$ 1,672,287

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