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Investments (Gross Gains And Losses Realized On Sales Of Investments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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

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- Definition This item represents the gain realized during the period from the sale of trading securities. + References 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 + Details
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