Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Consolidated Statements of Comprehensive Income
Net Income	$ 238,114		$ 202,237	[1]	$ 195,534	[1]
Components of other comprehensive income
Unrealized holding gains arising on available-for-sale fixed maturity investments	534,028	[2]	511,663	[2]	724,296	[2]
Net change during the period related to cash flow hedges	(18,881)		21,014		17,293
Reclassification adjustment for (gains) losses realized in net income	(107,713)		(74,165)		23,198
Net unrealized gains related to investments	407,434		458,512		764,787
Future policy benefits, deferred acquisition costs and value of business acquired adjustments	(83,835)		(100,216)		(129,715)
Employee benefit plan adjustment	(68,650)		(49,566)		(5,142)
Other, net	(152,485)		(149,782)		(134,857)
Other comprehensive income before income taxes	254,949		308,730		629,930
Income tax expense related to items of other comprehensive income	89,232		108,056		220,476
Other comprehensive income	165,717		200,674	[1]	409,454	[1]
Total comprehensive income	$ 403,831		$ 402,911		$ 604,988

[1] As adjusted; See Note 1

[2] Other comprehensive income includes the non-credit component of impaired losses on fixed maturities available-for-sale in the amounts of $26,583, $13,590 and $6,346 for the years ended December 31, 2012, 2011 and 2010, respectively.