INVESTMENT OPERATIONS (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
INVESTMENT OPERATIONS
Other-than-temporary impairments of investments recorded	$ 67,130,000	$ 62,210,000	[1]	$ 74,970,000	[1]
Other-than-temporary impairments of investments recorded in earnings	58,144,000	47,321,000	[1]	41,364,000	[1]
Other-than-temporary impairments of investments recorded in other comprehensive income (loss)	8,986,000	14,889,000	[1]	33,606,000	[1]
Other-than-temporary impairments related to debt or equity securities that the entity intended to sell or expected to be required to sell	0			0
Debt securities
INVESTMENT OPERATIONS
Other-than-temporary impairments of investments recorded	67,100,000	62,200,000		72,500,000
Other-than-temporary impairments of investments recorded in earnings	58,100,000	47,300,000
Other-than-temporary impairments of investments recorded in other comprehensive income (loss)	9,000,000	14,900,000
Pre-tax other-than-temporary impairments related to debt securities that the entity does not intend to sell and does not expect to be required to sell		52,700,000
Pre-tax other-than-temporary impairments credit losses related to debt securities that the entity does not intend to sell and does not expect to be required to sell recorded in earnings		37,800,000
Pre-tax other-than-temporary impairments credit losses related to debt securities that the entity does not intend to sell and does not expect to be required to sell recorded in other comprehensive income (loss)		14,900,000
Other-than-temporary impairments related to debt or equity securities that the entity intended to sell or expected to be required to sell		9,500,000
Credit losses on debt securities
Beginning balance	69,476,000	39,275,000		25,066,000
Additions for newly impaired securities	26,544,000	12,699,000		26,893,000
Additions for previously impaired securities	25,217,000	20,591,000		4,964,000
Reductions for previously impaired securities that were sold in the current period		(3,089,000)		(17,648,000)
Ending balance	121,237,000	69,476,000		39,275,000
Equity securities
INVESTMENT OPERATIONS
Other-than-temporary impairments of investments recorded	$ 0	$ 0		$ 2,500,000

[1] Recast from previously reported information