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Fair Value Disclosures (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Level 1 to level 2 Transfers, Amount | $ 40,435,000 | $ 79,638,000
Fair Value, Level 2 to level 1 Transfers, Amount | 22,224,000 | 58,979,000
Available-for-sale Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 30,789,000 | 77,346,000
Fair Value, Level 2 to level 1 Transfers, Amount | 11,156,000 | 55,723,000
Corporate Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 14,773,000 | 0
Fair Value, Level 2 to level 1 Transfers, Amount | 4,000 | 50,238,000
US Treasury and Government [Member] | Available-for-sale Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 0 | 75,501,000
Fair Value, Level 2 to level 1 Transfers, Amount | 11,152,000 | 0
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 12,794,000 | 0
Fair Value, Level 2 to level 1 Transfers, Amount | 0 | 5,485,000
Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 3,222,000 | 1,845,000
Fair Value, Level 2 to level 1 Transfers, Amount | 0 | 0
Equity Securities, Other [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 0 | 2,290,000
Fair Value, Level 2 to level 1 Transfers, Amount | 0 | 0
Nonredeemable Preferred Stock [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 9,646,000 | 2,000
Fair Value, Level 2 to level 1 Transfers, Amount | $ 11,068,000 | $ 3,256,000

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- Definition The amount of the transfers of assets or liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition The amount of the transfers of assets or liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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