FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets:
Available-for-sale securities	$ 27,540,938	$ 27,271,759
Total fixed maturity securities	30,065,491	29,787,959
Equity securities	415,176	411,786
Other long-term investments	139,595	113,364
Short-term investments	161,506	217,812
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	27,097,303	26,780,651
Residential mortgage-backed securities
Assets:
Available-for-sale securities	1,717,909	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
State, municipalities, and political subdivisions
Assets:
Available-for-sale securities	1,433,582	1,443,713
Other government-related securities
Assets:
Available-for-sale securities	88,477	100,778
Corporate bonds
Assets:
Available-for-sale securities	20,787,567	20,382,051
Level 3 \| Other asset-backed securities
Assets:
Total investments	560,668	596,143
Level 3 \| Other government-related securities
Assets:
Total investments	20,003	20,011
Level 3 \| Corporate bonds
Assets:
Total investments	129,667	168,007
Measured at fair value on a recurring basis \| Level 1
Assets:
Total fixed maturity securities	1,283,889	1,214,899
Equity securities	308,656	307,252
Other long-term investments	39,960	23,639
Short-term investments	158,030	215,320
Total investments	1,790,535	1,761,110
Cash	275,103	368,801
Other assets	8,443	8,239
Assets related to separate accounts
Variable annuity	10,670,833	9,601,417
Variable universal life	605,622	562,817
Total assets	13,350,536	12,302,384
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	27,995,542	27,714,025
Equity securities	37,102	35,116
Other long-term investments	42,518	58,134
Short-term investments	3,476	2,492
Total investments	28,078,638	27,809,767
Assets related to separate accounts
Total assets	28,078,638	27,809,767
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	25,398,857	25,082,071
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	1,717,905	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	259,955
Trading securities	1,728	1,169
Measured at fair value on a recurring basis \| Level 2 \| State, municipalities, and political subdivisions
Assets:
Available-for-sale securities	1,429,247	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	20,662,806	20,213,952
Trading securities	1,624,840	1,672,172
Measured at fair value on a recurring basis \| Level 3
Assets:
Total fixed maturity securities	786,060	859,035
Equity securities	69,418	69,418
Other long-term investments	57,117	31,591
Total investments	912,595	960,044
Assets related to separate accounts
Total assets	912,595	960,044
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	709,565	788,385
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 \| State, municipalities, and political subdivisions
Assets:
Available-for-sale securities	4,335	4,335
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 \| Fair Values
Assets:
Total fixed maturity securities	30,065,491	29,787,959
Equity securities	415,176	411,786
Other long-term investments	139,595	113,364
Short-term investments	161,506	217,812
Total investments	30,781,768	30,530,921
Cash	275,103	368,801
Other assets	8,443	8,239
Assets related to separate accounts
Variable annuity	10,670,833	9,601,417
Variable universal life	605,622	562,817
Total assets	42,341,769	41,072,195
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 \| Fair Values \| Fixed maturities
Assets:
Available-for-sale securities	27,097,303	26,780,651
Trading securities	2,968,188	3,007,308
Measured at fair value on a recurring basis \| Fair Values \| Residential mortgage-backed securities
Assets:
Available-for-sale securities	1,717,909	1,839,330
Trading securities	354,522	357,803
Measured at fair value on a recurring basis \| Fair Values \| 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 \| Fair Values \| 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 \| Fair Values \| U.S. government-related securities.
Assets:
Available-for-sale securities	1,207,052	1,169,943
Trading securities	296,736	305,873
Measured at fair value on a recurring basis \| Fair Values \| State, municipalities, and political subdivisions
Assets:
Available-for-sale securities	1,433,582	1,443,713
Trading securities	283,842	278,898
Measured at fair value on a recurring basis \| Fair Values \| 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 \| Fair Values \| Corporate bonds
Assets:
Available-for-sale securities	20,787,567	20,382,051
Trading securities	$ 1,629,952	$ 1,672,287

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