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Investments (Net Realized Investments Gains) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Investments [Line Items] |  |  |
Net realized investment gains (losses) | $ 58,397 | $ 57,089 | $ 346,444
Trading securities, net realized gains | 49,400 | 52,500 | 338,700
Parent Company [Member] |  |  |
Investments [Line Items] |  |  |
Net realized investment gains (losses) | (1,866) | 1,420 | 6,373
Fixed Maturity Securities [Member] |  |  |
Investments [Line Items] |  |  |
Net realized investment gains (losses) | 54,112 | 5,909 | 255,195
Trading securities, net realized gains | 2,675 | 8,754 | 1,918
Equity Securities [Member] |  |  |
Investments [Line Items] |  |  |
Net realized investment gains (losses) | (4,854) | 46,547 | 83,452
Trading securities, net realized gains | 41,872 | 16,793 | 20,558
Short-Term Investments [Member] |  |  |
Investments [Line Items] |  |  |
Net realized investment gains (losses) | 139 | 18 | 76
Trading securities, net realized gains | 120 | 64 | 356
Option And Short Sale Transactions [Member] |  |  |
Investments [Line Items] |  |  |
Net realized investment gains (losses) | $ 9,000 | $ 4,615 | $ 7,721

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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Subparagraph a -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 + Details
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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 -Article 5 -Section 03 -Paragraph 7 -Subparagraph c 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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