CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 202,259	$ 83,725	$ 350,729	$ 395,280
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) arising during the period	120,550	(262,901)	191,933	(281,426)
Adjustment for reclassification of net realized investment gains and OTTI losses recognized in net income	(33,929)	(4,066)	(43,543)	(37,914)
Unrealized gains (losses) arising during the period, net of reclassification adjustment	86,621	(266,967)	148,390	(319,340)
Non-credit portion of OTTI losses	0	0	0	0
Foreign currency translation adjustment	3,790	(18,386)	6,449	(18,527)
Total other comprehensive income (loss), net of tax	90,411	(285,353)	154,839	(337,867)
Comprehensive income (loss)	$ 292,670	$ (201,628)	$ 505,568	$ 57,413