ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Unrealized Gains and Losses on Investments	Dec. 31, 2013 Unrealized Gains and Losses on Investments	Dec. 31, 2012 Unrealized Gains and Losses on Investments	Jun. 30, 2014 Accumulated Gain and Loss Derivatives	Dec. 31, 2013 Accumulated Gain and Loss Derivatives	Jun. 30, 2014 Postretirement Benefits Liability Adjustment	Dec. 31, 2013 Postretirement Benefits Liability Adjustment
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance			$ 494,066,000	$ 1,736,722,000	$ 1,736,722,000	$ 539,003,000	$ 1,813,516,000		$ (1,235,000)	$ (3,496,000)	$ (43,702,000)	$ (73,298,000)
Other comprehensive income (loss) before reclassifications			884,103,000		(1,220,168,000)	884,120,000	(1,250,498,000)		(17,000)	734,000		29,596,000
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings	(1,061,000)	(2,402,000)	3,450,000	5,435,000	4,591,000	3,450,000	4,591,000
Amounts reclassified from accumulated other comprehensive income (loss)			(12,754,000)		(27,079,000)	(15,936,000)	(28,606,000)		835,000	1,527,000	2,347,000
Total other comprehensive income (loss)			874,799,000		(1,242,656,000)	871,634,000	(1,274,513,000)		818,000	2,261,000	2,347,000	29,596,000
Ending Balance	1,368,865,000		1,368,865,000		494,066,000	1,410,637,000	539,003,000		(417,000)	(1,235,000)	(41,355,000)	(43,702,000)
Impact of DAC and VOBA						$ 413,400,000	$ 198,100,000	$ 204,900,000