Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 542,939us-gaap_NetIncomeLoss	$ 528,472us-gaap_NetIncomeLoss	$ 529,324us-gaap_NetIncomeLoss
Unrealized gains (losses) on securities:
Total unrealized investment gains (losses)	1,283,062	(1,183,652)	614,854
Less applicable taxes	(448,985)	415,481	(215,194)
Unrealized gains (losses) on investments, net of tax	834,077	(768,171)	399,660
Unrealized gains (losses) attributable to deferred acquisition costs	(6,200)	14,906	7,234
Less applicable taxes	2,170	(5,217)	(2,532)
Unrealized gains (losses) attributable to deferred acquisition costs, net of tax	(4,030)	9,689	4,702
Foreign exchange translation adjustments, other than securities	(10,770)	(2,962)	3,487
Less applicable taxes	3,290	1,220	(1,118)
Foreign exchange translation adjustments, other than securities, net of tax	(7,480)	(1,742)	2,369
Pension adjustments:
Amortization of pension costs	10,285	18,366	14,799
Plan amendments	0	0	(3,452)
Experience gain (loss)	(65,817)	52,296	(59,613)
Pension adjustments	(55,532)	70,662	(48,266)
Less applicable taxes	19,436	(24,732)	16,894
Pension adjustments, net of tax	(36,096)	45,930	(31,372)
Other comprehensive income (loss)	786,471	(714,294)	375,359
Comprehensive income (loss)	1,329,410us-gaap_ComprehensiveIncomeNetOfTax	(185,822)us-gaap_ComprehensiveIncomeNetOfTax	904,683us-gaap_ComprehensiveIncomeNetOfTax
Securities [Member]
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during period	1,312,841	(1,166,332)	657,954
Reclassification adjustment for (gains) losses included in net income	(23,771)	(13,138)	(41,745)
Reclassification adjustment for amortization of (discount) premium	(8,621)	(6,569)	462
Foreign exchange adjustment on securities recorded at fair value	(1,567)	(1,173)	(4,334)
Total unrealized investment gains (losses)	1,278,882	(1,187,212)	612,337
Other Investments [Member]
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during period	4,180	28	2,517
Reclassification adjustment for (gains) losses included in net income	0	3,532	0
Total unrealized investment gains (losses)	$ 4,180	$ 3,560	$ 2,517

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