Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Income and Comprehensive Income [Abstract]
Net earnings	$ 391,240	$ 255,243	$ 345,096
Investment gains (losses)
Investment gains (losses) during the year	135,746	195,395	(9,873)
Income tax charge (benefit)	46,779	65,618	(3,098)
Investments gains (losses), net of tax	88,967	129,777	(6,775)
Less reclassification adjustments for
Gains (losses) included in net earnings	30,120	(1,022)	11,784
Income tax charge (benefit)	10,542	(358)	4,124
Gains (losses) included in net earnings, net of tax	19,578	(664)	7,660
Net unrealized investment gains (losses)	69,389	130,441	(14,435)
Foreign currency translation adjustment	(2,720)	(1,740)	(9,248)
Income tax charge (benefit)	(943)	(1,772)	(1,204)
Foreign currency translation adjustment, net of tax	(1,777)	32	(8,044)
Other comprehensive income (loss)	67,612	130,473	(22,479)
Comprehensive income	$ 458,852	$ 385,716	$ 322,617

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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- Definition

Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (e,f)

-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-Subparagraph c(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e640-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 25

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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