ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $)	3 Months Ended		12 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 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	Mar. 31, 2014 Accumulated Gain and Loss Derivatives	Dec. 31, 2013 Accumulated Gain and Loss Derivatives
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance	$ 538,966,000	$ 1,811,124,000	$ 1,811,124,000	$ 540,201,000	$ 1,814,620,000		$ (1,235,000)	$ (3,496,000)
Other comprehensive income (loss) before reclassifications	482,334,000		(1,249,682,000)	481,747,000	(1,250,416,000)		587,000	734,000
Other comprehensive income relating to other-than-temporary impaired investments for which a portion has been recognized in earnings	4,511,000	7,837,000	4,591,000	4,511,000	4,591,000
Amounts reclassified from accumulated other comprehensive income (loss)	(3,320,000)		(27,067,000)	(3,756,000)	(28,594,000)		436,000	1,527,000
Net current-period other comprehensive income (loss)	483,525,000		(1,272,158,000)	482,502,000	(1,274,419,000)		1,023,000	2,261,000
Ending Balance	1,022,491,000		538,966,000	1,022,703,000	540,201,000		(212,000)	(1,235,000)
Impact of DAC and VOBA				$ 316,200,000	$ 198,100,000	$ 204,900,000