Investments (Gross Gains And Losses Realized On Sales Of Investments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fixed Maturity Securities [Member]
Investments [Line Items]
Gross Realized Gains	$ 11,473	$ 2,675	$ 8,754
Gross Realized Losses	(83)	(10,712)	(3,812)
Net	11,390	(8,037)	4,942
Equity Securities [Member]
Investments [Line Items]
Gross Realized Gains	19,538	41,872	16,793
Gross Realized Losses	(12,017)	(15,847)	(15,905)
Net	7,521	26,025	888
Short-Term Investments [Member]
Investments [Line Items]
Gross Realized Gains	2	120	64
Gross Realized Losses	(722)	0	0
Net	$ (720)	$ 120	$ 64

This item represents the gain (loss) realized during the period from the sale of trading securities.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph c

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7(c))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Name:	us-gaap_TradingSecuritiesRealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration