FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 3) (USD $)	3 Months Ended													3 Months Ended								3 Months Ended									3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Total investments	Mar. 31, 2012 Total investments	Mar. 31, 2013 Fixed maturities	Mar. 31, 2012 Fixed maturities	Mar. 31, 2013 Fixed maturities Available-for-sale securities	Mar. 31, 2012 Fixed maturities Available-for-sale securities	Mar. 31, 2013 Fixed maturities Trading securities	Mar. 31, 2012 Fixed maturities Trading securities	Mar. 31, 2012 Residential mortgage-backed securities Available-for-sale securities	Mar. 31, 2013 Residential mortgage-backed securities Available-for-sale securities	Dec. 31, 2012 Residential mortgage-backed securities Available-for-sale securities	Mar. 31, 2013 Other asset-backed securities Available-for-sale securities	Mar. 31, 2012 Other asset-backed securities Available-for-sale securities	Mar. 31, 2013 Other asset-backed securities Trading securities	Mar. 31, 2012 U.S. government-related securities. Available-for-sale securities	Mar. 31, 2012 U.S. government-related securities. Trading securities	Mar. 31, 2012 States, municipals, and political subdivisions Available-for-sale securities	Mar. 31, 2013 States, municipals, and political subdivisions Available-for-sale securities	Dec. 31, 2012 States, municipals, and political subdivisions Available-for-sale securities	Mar. 31, 2013 Other government-related securities Available-for-sale securities	Mar. 31, 2012 Other government-related securities Available-for-sale securities	Mar. 31, 2013 Corporate bonds Available-for-sale securities	Mar. 31, 2012 Corporate bonds Available-for-sale securities	Mar. 31, 2013 Corporate bonds Trading securities	Mar. 31, 2012 Corporate bonds Trading securities	Mar. 31, 2012 Equity securities	Mar. 31, 2013 Equity securities	Dec. 31, 2012 Equity securities	Mar. 31, 2013 Other long-term investments	Mar. 31, 2012 Other long-term investments	Mar. 31, 2013 Annuity account balances	Mar. 31, 2012 Annuity account balances	Mar. 31, 2013 Other liabilities.	Mar. 31, 2012 Other liabilities.
Assets:
Beginning Balance	$ 960,044,000	$ 871,122,000	$ 960,044,000	$ 871,122,000	$ 859,035,000	$ 777,833,000	$ 788,385,000	$ 749,490,000	$ 70,650,000	$ 28,343,000	$ 7,000	$ 4,000	$ 4,000	$ 596,143,000	$ 614,813,000	$ 70,535,000	$ 15,000,000	$ 28,343,000	$ 69,000	$ 4,335,000	$ 4,335,000	$ 20,011,000		$ 167,892,000	$ 119,601,000	$ 115,000		$ 80,586,000	$ 69,418,000	$ 69,418,000	$ 31,591,000	$ 12,703,000
Total Realized and Unrealized Gains Included in Earnings	28,944,000	13,813,000	28,944,000	13,813,000	3,409,000	740,000		294,000	3,409,000	446,000					294,000	3,408,000		446,000								1,000					25,535,000	13,073,000
Total Realized and Unrealized Gains Included in Other Comprehensive Income	942,000	1,311,000	942,000	1,311,000	942,000	676,000	942,000	676,000						12,000	493,000									930,000	183,000			635,000
Total Realized and Unrealized Losses Included in Earnings	(268,000)	(169,000)	(268,000)	(169,000)	(259,000)	(169,000)			(259,000)	(169,000)						(259,000)		(169,000)													(9,000)
Total Realized and Unrealized Losses Included in Other Comprehensive Income	(29,915,000)	(15,174,000)	(29,915,000)	(15,174,000)	(29,915,000)	(15,173,000)	(29,915,000)	(15,173,000)						(27,548,000)	(13,929,000)		(1,000)					(3,000)	(16,000)	(2,364,000)	(1,227,000)			(1,000)
Purchases		52,012,000		52,012,000		52,008,000		24,302,000		27,706,000								27,705,000	4,275,000				20,023,000		4,000		1,000	4,000
Sales	(53,920,000)	(30,800,000)	(53,920,000)	(30,800,000)	(53,920,000)	(30,800,000)	(51,080,000)	(28,992,000)	(2,840,000)	(1,808,000)	(3,000)			(9,009,000)	(13,850,000)	(2,823,000)	(15,000,000)	(1,808,000)						(42,071,000)	(139,000)	(17,000)
Transfers in/or out of Level 3	6,240,000	19,554,000	6,240,000	19,554,000	6,240,000	19,554,000	1,227,000	19,554,000	5,013,000					1,227,000											19,554,000	5,013,000
Other	528,000	236,000	528,000	236,000	528,000	236,000	6,000	(208,000)	522,000	444,000				(157,000)	(208,000)	522,000	1,000	444,000				(5,000)	(1,000)	168,000
Ending Balance	912,595,000	911,905,000	912,595,000	911,905,000	786,060,000	804,905,000	709,565,000	749,943,000	76,495,000	54,962,000	4,000	4,000	4,000	560,668,000	587,613,000	71,383,000		54,961,000	4,344,000	4,335,000	4,335,000	20,003,000	20,006,000	124,555,000	137,976,000	5,112,000	1,000	81,224,000	69,418,000	69,418,000	57,117,000	25,776,000
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date	28,810,000	13,350,000	28,810,000	13,350,000	3,284,000	277,000			3,284,000	277,000						3,255,000		277,000								29,000					25,526,000	13,073,000
Liabilities:
Beginning Balance	740,905,000	574,075,000																															129,468,000	136,462,000	611,437,000	437,613,000
Total Realized and Unrealized Gains Included in Earnings	84,546,000	56,496,000																																	84,546,000	56,496,000
Total Realized and Unrealized Losses Included in Earnings	(14,923,000)	(11,769,000)																															(2,000,000)	(3,074,000)	(12,923,000)	(8,695,000)
Issuances	136,000	325,000																															136,000	325,000
Settlements	7,923,000	2,623,000																															7,923,000	2,623,000
Ending Balance	663,495,000	527,050,000																															123,681,000	137,238,000	539,814,000	389,812,000
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date	71,623,000	47,801,000																																	71,623,000	47,801,000
Transfers
Securities transferred into Level 3	6,200,000	19,600,000
Securities transferred out of Level 3	0	0
Transfers from Level 2 to Level 1	0	0
Transfers from Level 1	$ 0	$ 0