INVESTMENT OPERATIONS (Details 4) (USD $)				3 Months Ended		6 Months Ended							6 Months Ended	12 Months Ended									3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Below investment grade	Jun. 30, 2013 Fixed maturities	Jun. 30, 2012 Fixed maturities	Jun. 30, 2013 Fixed maturities	Jun. 30, 2012 Fixed maturities	Dec. 31, 2012 Fixed maturities	Jun. 30, 2013 Residential mortgage-backed securities	Dec. 31, 2012 Residential mortgage-backed securities	Jun. 30, 2013 Commercial mortgage-backed securities	Dec. 31, 2012 Commercial mortgage-backed securities	Jun. 30, 2013 Other asset-backed securities	Dec. 31, 2012 Other asset-backed securities	Jun. 30, 2013 U.S. government-related securities	Dec. 31, 2012 U.S. government-related securities	Jun. 30, 2013 Other government-related securities	Dec. 31, 2012 Other government-related securities	Jun. 30, 2013 States, municipals, and political subdivisions	Dec. 31, 2012 States, municipals, and political subdivisions	Jun. 30, 2013 Corporate bonds	Dec. 31, 2012 Corporate bonds	Jun. 30, 2013 Equity securities	Jun. 30, 2012 Equity securities	Jun. 30, 2013 Equity securities	Jun. 30, 2012 Equity securities	Dec. 31, 2012 Equity securities
Fair Value
Less Than 12 Months	$ 5,688,591,000	$ 1,578,240,000							$ 213,323,000	$ 101,522,000	$ 465,172,000	$ 50,601,000	$ 119,661,000	$ 479,223,000	$ 594,696,000	$ 107,802,000	$ 20,000,000	$ 14,955,000	$ 65,302,000	$ 11,526,000	$ 4,018,798,000	$ 777,552,000	$ 191,639,000		$ 191,639,000		$ 35,059,000
12 Months or More	891,885,000	794,622,000							132,251,000	166,000,000	6,816,000		548,015,000	242,558,000							181,307,000	364,110,000	23,496,000		23,496,000		21,954,000
Total	6,580,476,000	2,372,862,000							345,574,000	267,522,000	471,988,000	50,601,000	667,676,000	721,781,000	594,696,000	107,802,000	20,000,000	14,955,000	65,302,000	11,526,000	4,200,105,000	1,141,662,000	215,135,000		215,135,000		57,013,000
Unrealized Loss
Less Than 12 Months	(344,885,000)	(68,099,000)							(8,659,000)	(9,605,000)	(21,794,000)	(598,000)	(7,234,000)	(28,179,000)	(25,033,000)	(595,000)	(1,000)	(45,000)	(3,987,000)	(264,000)	(272,018,000)	(23,663,000)	(6,159,000)		(6,159,000)		(5,150,000)
12 Months or More	(67,043,000)	(72,681,000)							(6,461,000)	(9,770,000)	(276,000)		(31,888,000)	(33,245,000)							(21,439,000)	(24,783,000)	(6,979,000)		(6,979,000)		(4,883,000)
Total	(411,928,000)	(140,780,000)							(15,120,000)	(19,375,000)	(22,070,000)	(598,000)	(39,122,000)	(61,424,000)	(25,033,000)	(595,000)	(1,000)	(45,000)	(3,987,000)	(264,000)	(293,457,000)	(48,446,000)	(13,138,000)		(13,138,000)		(10,033,000)
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%
Available-for-sale securities, fair value	26,575,015,000	27,271,759,000	1,400,000,000	26,070,433,000		26,070,433,000		26,780,651,000	1,572,239,000	1,839,330,000	942,804,000	869,823,000	922,912,000	975,013,000	1,176,167,000	1,169,943,000	65,685,000	100,778,000	1,337,745,000	1,443,713,000	20,052,881,000	20,382,051,000	424,135,000		424,135,000		392,231,000
Available-for-sale securities, amortized cost	25,040,468,000	24,162,714,000	1,400,000,000	24,531,216,000		24,531,216,000		23,674,016,000	1,532,242,000	1,766,440,000	937,514,000	797,844,000	947,236,000	1,023,649,000	1,160,068,000	1,099,001,000	62,795,000	93,565,000	1,191,794,000	1,188,077,000	18,699,567,000	17,705,440,000	428,805,000		428,805,000		389,821,000
Securities in trading portfolio			356,500,000	2,900,000,000		2,900,000,000		3,000,000,000															22,400,000		22,400,000		19,600,000
Securities Not publicly traded			423,600,000
Change in unrealized gains (losses), net of income tax				$ (849,033,000)	$ 340,781,000	$ (1,018,822,000)	$ 360,227,000																$ (8,392,000)	$ (1,411,000)	$ (4,602,000)	$ 3,695,000