Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income	$ 528,472	$ 529,324	$ 497,161
Unrealized gains (losses) on securities:
Total unrealized investment gains (losses)	(1,183,652)	614,854	856,692
Less applicable taxes	415,481	(215,194)	(299,843)
Unrealized gains (losses) on investments, net of tax	(768,171)	399,660	556,849
Unrealized gains (losses) attributable to deferred acquisition costs	14,906	7,234	(28,292)
Less applicable taxes	(5,217)	(2,532)	9,902
Unrealized gains (losses) attributable to deferred acquisition costs, net of tax	9,689	4,702	(18,390)
Foreign exchange translation adjustments, other than securities	(2,962)	3,487	(3,261)
Less applicable taxes	1,220	(1,118)	699
Foreign exchange translation adjustments, other than securities, net of tax	(1,742)	2,369	(2,562)
Pension adjustments:
Amortization of pension costs	18,366	14,799	12,146
Plan amendments	0	(3,452)	0
Experience gain (loss)	52,296	(59,613)	(26,106)
Pension adjustments	70,662	(48,266)	(13,960)
Less applicable taxes	(24,732)	16,894	4,887
Pension adjustments, net of tax	45,930	(31,372)	(9,073)
Other comprehensive income (loss)	(714,294)	375,359	526,824
Comprehensive income (loss)	(185,822)	904,683	1,023,985
Securities [Member]
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during period	(1,166,332)	657,954	882,467
Reclassification adjustment for (gains) losses included in net income	(13,138)	(41,745)	(27,771)
Reclassification adjustment for amortization of (discount) premium	(6,569)	462	(1,880)
Foreign exchange adjustment on securities recorded at fair value	(1,173)	(4,334)	3,510
Total unrealized investment gains (losses)	(1,187,212)	612,337	856,326
Other Investments [Member]
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during period	28	2,517	366
Reclassification adjustment for (gains) losses included in net income	3,532	0	0
Total unrealized investment gains (losses)	$ 3,560	$ 2,517	$ 366