FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets:
Available-for-sale securities	$ 23,617,980
Total fixed maturity securities	26,133,625	24,676,939
Equity securities	349,738	359,412
Other long-term investments	38,610	35,667
Short-term investments	134,698	352,824
Assets related to separate accounts
Variable annuity	6,291,158	5,170,193
Variable universal life	556,419	534,219
Liabilities:
Other liabilities	246,744	243,511
Fixed maturities \| Measured at fair value on a recurring basis \| Level 1
Assets:
Available-for-sale securities	913,188	1,069,468
Trading securities	392,523	383,423
Fixed maturities \| Measured at fair value on a recurring basis \| Level 2
Assets:
Available-for-sale securities	21,562,932	19,890,251
Trading securities	2,407,484	2,529,161
Fixed maturities \| Measured at fair value on a recurring basis \| Level 3
Assets:
Available-for-sale securities	770,852	741,269
Trading securities	86,646	63,367
Fixed maturities \| Measured at fair value on a recurring basis \| Fair Values
Assets:
Available-for-sale securities	23,246,972	21,700,988
Trading securities	2,886,653	2,975,951
Residential mortgage-backed securities \| Measured at fair value on a recurring basis \| Level 2
Assets:
Available-for-sale securities	2,490,156	2,547,730
Trading securities	348,536	432,015
Residential mortgage-backed securities \| Measured at fair value on a recurring basis \| Level 3
Assets:
Available-for-sale securities	7	20
Residential mortgage-backed securities \| Measured at fair value on a recurring basis \| Fair Values
Assets:
Available-for-sale securities	2,490,163	2,547,750
Trading securities	348,536	432,015
Commercial mortgage-backed securities \| Measured at fair value on a recurring basis \| Level 2
Assets:
Available-for-sale securities	287,504	155,125
Trading securities	170,034	137,606
Commercial mortgage-backed securities \| Measured at fair value on a recurring basis \| Level 3
Assets:
Available-for-sale securities		19,901
Commercial mortgage-backed securities \| Measured at fair value on a recurring basis \| Fair Values
Assets:
Available-for-sale securities	287,504	175,026
Trading securities	170,034	137,606
Other asset-backed securities \| Measured at fair value on a recurring basis \| Level 2
Assets:
Available-for-sale securities	206,517	207,638
Trading securities	20,486	18,415
Other asset-backed securities \| Measured at fair value on a recurring basis \| Level 3
Assets:
Available-for-sale securities	637,746	641,129
Trading securities	41,093	59,925
Other asset-backed securities \| Measured at fair value on a recurring basis \| Fair Values
Assets:
Available-for-sale securities	844,263	848,767
Trading securities	61,579	78,340
Other government-related securities \| Measured at fair value on a recurring basis \| Level 1
Assets:
Available-for-sale securities	15,016	14,993
Other government-related securities \| Measured at fair value on a recurring basis \| Level 2
Assets:
Available-for-sale securities	128,103	186,214
Trading securities	110,343	126,553
Other government-related securities \| Measured at fair value on a recurring basis \| Fair Values
Assets:
Available-for-sale securities	143,119	201,207
Trading securities	110,343	126,553
States, municipals, and political subdivisions \| Measured at fair value on a recurring basis \| Level 2
Assets:
Available-for-sale securities	1,174,748	963,225
Trading securities	208,383	160,539
States, municipals, and political subdivisions \| Measured at fair value on a recurring basis \| Level 3
Assets:
Available-for-sale securities	74	78
States, municipals, and political subdivisions \| Measured at fair value on a recurring basis \| Fair Values
Assets:
Available-for-sale securities	1,174,822	963,303
Trading securities	208,383	160,539
Corporate bonds \| Measured at fair value on a recurring basis \| Level 1
Assets:
Available-for-sale securities	100	100
Trading securities	3,982
Corporate bonds \| Measured at fair value on a recurring basis \| Level 2
Assets:
Available-for-sale securities	17,057,663	15,725,900
Trading securities	1,541,094	1,642,664
Corporate bonds \| Measured at fair value on a recurring basis \| Level 3
Assets:
Available-for-sale securities	118,025	65,032
Trading securities	42,041
Corporate bonds \| Measured at fair value on a recurring basis \| Fair Values
Assets:
Available-for-sale securities	17,175,788	15,791,032
Trading securities	1,587,117	1,642,664
Measured at fair value on a recurring basis \| Level 1
Assets:
Total fixed maturity securities	1,305,711	1,452,891
Equity securities	257,575	271,483
Other long-term investments	7,005	6,794
Short-term investments	134,698	344,796
Total investments	1,704,989	2,075,964
Cash	419,210	264,425
Other assets	7,204	6,222
Assets related to separate accounts
Variable annuity	6,291,158	5,170,193
Variable universal life	556,419	534,219
Total assets	8,978,980	8,051,023
Liabilities:
Other liabilities	6,578	23,995
Total liabilities	6,578	23,995
Measured at fair value on a recurring basis \| Level 1 \| U.S. government-related securities.
Assets:
Available-for-sale securities	898,072	1,054,375
Trading securities	388,541	383,423
Measured at fair value on a recurring basis \| Level 2
Assets:
Total fixed maturity securities	23,970,416	22,419,412
Equity securities	11,381	10,831
Other long-term investments	4,074	3,808
Short-term investments		8,028
Total investments	23,985,871	22,442,079
Assets related to separate accounts
Total assets	23,985,871	22,442,079
Liabilities:
Other liabilities	26,507	28,987
Total liabilities	26,507	28,987
Measured at fair value on a recurring basis \| Level 2 \| U.S. government-related securities.
Assets:
Available-for-sale securities	218,241	104,419
Trading securities	8,608	11,369
Measured at fair value on a recurring basis \| Level 3
Assets:
Total fixed maturity securities	857,498	804,636
Equity securities	80,782	77,098
Other long-term investments	27,531	25,065
Total investments	965,811	906,799
Assets related to separate accounts
Total assets	965,811	906,799
Liabilities:
Annuity account balances.	142,470	143,264
Other liabilities	213,659	190,529
Total liabilities	356,129	333,793
Measured at fair value on a recurring basis \| Level 3 \| U.S. government-related securities.
Assets:
Available-for-sale securities	15,000	15,109
Trading securities	3,512	3,442
Measured at fair value on a recurring basis \| Fair Values
Assets:
Total fixed maturity securities	26,133,625	24,676,939
Equity securities	349,738	359,412
Other long-term investments	38,610	35,667
Short-term investments	134,698	352,824
Total investments	26,656,671	25,424,842
Cash	419,210	264,425
Other assets	7,204	6,222
Assets related to separate accounts
Variable annuity	6,291,158	5,170,193
Variable universal life	556,419	534,219
Total assets	33,930,662	31,399,901
Liabilities:
Annuity account balances.	142,470	143,264
Other liabilities	246,744	243,511
Total liabilities	389,214	386,775
Measured at fair value on a recurring basis \| Fair Values \| U.S. government-related securities.
Assets:
Available-for-sale securities	1,131,313	1,173,903
Trading securities	400,661	398,234
Level 2 \| Asset-Backed Securities
Assets:
Total investments	3,500,000
Level 3 \| Asset-Backed Securities
Assets:
Total investments	678,800
Fixed maturities
Assets:
Available-for-sale securities	23,246,972
Residential mortgage-backed securities
Assets:
Available-for-sale securities	2,490,163
Commercial mortgage-backed securities
Assets:
Available-for-sale securities	287,504
Other asset-backed securities
Assets:
Available-for-sale securities	844,263
States, municipals, and political subdivisions
Assets:
Available-for-sale securities	1,174,822
Other government-related securities
Assets:
Available-for-sale securities	143,119
Corporate bonds
Assets:
Available-for-sale securities	$ 17,175,788

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