Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 43,413		$ 61,048		$ 117,640		$ 112,042
Components of other comprehensive income (loss)
Unrealized gains (losses) arising on fixed maturities, available-for-sale	(612,083)	[1]	177,624	[1]	(652,701)	[1]	211,734	[1]
Net change during the period related to cash flow hedges	(7,040)		11,585		16,908		7,039
Reclassification adjustment for (gains) losses realized in net income	2,251		(27,290)		(19,436)		(44,681)
Net unrealized gains (losses) related to investments	(616,872)		161,919		(655,229)		174,092
Future policy benefits, deferred acquisition costs and value of business acquired adjustments	125,324		(41,214)		140,011		(29,063)
Other comprehensive income (loss) before income taxes	(491,548)		120,705		(515,218)		145,029
Income tax (benefit) expense related to items of other comprehensive income (loss)	(172,042)		42,247		(180,327)		50,760
Other comprehensive income (loss)	(319,506)		78,458		(334,891)		94,269
Comprehensive income (loss)	$ (276,093)		$ 139,506		$ (217,251)		$ 206,311

[1] Other comprehensive income (loss) includes the non-credit component of impaired losses on fixed maturities available-for-sale in the amounts of $2,919 and $1,215 for the three months ended June 30, 2013 and 2012, respectively, and $6,645 and $6,933 for the six months ended June 30, 2013 and 2012, respectively.