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Investments Net Realized Gains Losses on Invesments, Excluding Other Than Temporary Impairments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Investments, Net Realized Gain (Loss) | $ 1,471 | $ (1,238) | $ (611) | $ (6,076) | $ 698 | $ (17,292) | $ (854) | $ (1,193) | $ (6,454) | $ (18,641) | $ 23,726
Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Gross Realized Gains |  |  |  |  |  |  |  |  | 10,906 | 12,614 | 27,755
Available-for-sale Securities, Gross Realized Losses |  |  |  |  |  |  |  |  | (562) | (1,423) | (2,575)
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments |  |  |  |  |  |  |  |  | 10,344 | 11,191 | 25,180
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Gross Realized Gains |  |  |  |  |  |  |  |  | 562 | 966 | 14,384
Available-for-sale Securities, Gross Realized Losses |  |  |  |  |  |  |  |  | 0 | 0 | (71)
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments |  |  |  |  |  |  |  |  | 562 | 966 | 14,313
Other Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Sales of Other Real Estate |  |  |  |  |  |  |  |  | 5,149 | 377 | 0
Other Investments, Impairment Losses |  |  |  |  |  |  |  |  | (5,677) | (405) | (542)
Other Investments, Net Realized Gain (Loss) |  |  |  |  |  |  |  |  | (528) | (28) | (542)
Mortgage Loans on Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate, Write-down or Reserve, Amount |  |  |  |  |  |  |  |  | $ (16,832) | $ (30,770) | $ (15,225)
Maximum [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Impairment, Recovary of Book Value, Reasonable Period |  |  |  |  |  |  |  |  | 18 |  |

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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. + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 22 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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- Definition The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 14 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 13 -Subparagraph g -Chapter V -Subsection II -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. + Details
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