Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net income	$ 71,971		$ 70,575		$ 134,753		$ 186,523
Components of other comprehensive income (loss)
Unrealized (losses) gains arising on fixed maturities, available-for-sale	(20,574)	[1]	281,812	[1]	(650,447)	[1]	488,870	[1]
Net change during the period related to cash flow hedges	(49,908)		(8,578)		(33,000)		(1,539)
Reclassification adjustment for losses (gains) realized in net income	(13,454)		(26,467)		(35,510)		(69,234)
Net unrealized (losses) gains related to investments	(83,936)		246,767		(718,957)		418,097
Future policy benefits, DAC, and VOBA adjustment	26,455		(78,023)		162,987		(106,646)
Other comprehensive income (loss) before income taxes	(57,481)		168,744		(555,970)		311,451
Income tax (benefit) expense related to items of other comprehensive income (loss)	(20,117)		59,060		(194,589)		109,008
Other comprehensive income (loss)	(37,364)		109,684		(361,381)		202,443
Comprehensive income (loss)	$ 34,607		$ 180,259		$ (226,628)		$ 388,966

[1] Other comprehensive income (loss) includes the non-credit component of impaired losses on fixed maturities available-for-sale in the amounts of $3,173 and $9,218 for the three months ended September 30, 2013 and 2012, respectively, and $9,818 and $16,151 for the nine months ended September 30, 2013 and 2012, respectively.