Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 66,835		$ 49,923
Components of other comprehensive income (loss)
Unrealized gains (losses) arising on fixed maturities, available-for-sale	(41,181)	[1]	34,733	[1]
Net change during the period related to cash flow hedges	23,948		(4,546)
Reclassification adjustment for (gains) losses realized in net income	(24,580)		(17,891)
Net unrealized gains (losses) related to investments	(41,813)		12,296
Future policy benefits, deferred acquisition costs and value of business acquired adjustments	15,359		12,108
Other comprehensive income (loss) before income taxes	(26,454)		24,404
Income tax (benefit) expense related to items of other comprehensive income (loss)	(9,259)		8,541
Other comprehensive income (loss)	(17,195)		15,863
Total comprehensive income	$ 49,640		$ 65,786

[1] Other comprehensive income (loss) includes the non-credit component of impaired losses on fixed maturities available-for-sale in the amounts of $3,726 and $5,718 for the three months ended March 31, 2013 and 2012, respectively.