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Fair Value Measurement (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Valuation Techniques) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | $ 3,359,767 | $ 3,403,822
Liabilities, Fair Value Disclosure, Recurring | 1,615 | 4,219
Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 451,840 | 742,886
Liabilities, Fair Value Disclosure, Recurring | 51 | 194
Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 2,894,182 | 2,649,217
Liabilities, Fair Value Disclosure, Recurring | 1,564 | 4,025
Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 13,745 | 11,719
Liabilities, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | US Treasury and Government [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 24,783 | 16,108
Fixed maturity securities [Member] | US Treasury and Government [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 24,783 | 16,108
Fixed maturity securities [Member] | US Treasury and Government [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | US Treasury and Government [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 2,486,708 | 2,275,455
Fixed maturity securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 2,486,708 | 2,275,455
Fixed maturity securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 59,091 | 47,691
Fixed maturity securities [Member] | Collateralized Mortgage Backed Securities [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Collateralized Mortgage Backed Securities [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 59,091 | 47,691
Fixed maturity securities [Member] | Collateralized Mortgage Backed Securities [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Corporate Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 269,384 | 256,930
Fixed maturity securities [Member] | Corporate Debt Securities [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Corporate Debt Securities [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 269,384 | 256,930
Fixed maturity securities [Member] | Corporate Debt Securities [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 50,663 | 22,216
Fixed maturity securities [Member] | Collateralized Debt Obligations [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Collateralized Debt Obligations [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 50,663 | 22,216
Fixed maturity securities [Member] | Collateralized Debt Obligations [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Public Utility, Equities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 73,704 | 105,485
Equity Securities [Member] | Public Utility, Equities [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 73,704 | 105,485
Equity Securities [Member] | Public Utility, Equities [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Public Utility, Equities [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Banks, Trust and Insurance, Equities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 11,090 | 9,757
Equity Securities [Member] | Banks, Trust and Insurance, Equities [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 11,090 | 9,757
Equity Securities [Member] | Banks, Trust and Insurance, Equities [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Banks, Trust and Insurance, Equities [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Industrial, Miscellaneous, and All Others [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 190,882 | 257,356
Equity Securities [Member] | Industrial, Miscellaneous, and All Others [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 190,882 | 257,356
Equity Securities [Member] | Industrial, Miscellaneous, and All Others [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Industrial, Miscellaneous, and All Others [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Nonredeemable Preferred Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 26,169 | 28,563
Equity Securities [Member] | Nonredeemable Preferred Stock [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Nonredeemable Preferred Stock [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 26,169 | 28,563
Equity Securities [Member] | Nonredeemable Preferred Stock [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Partnership Interest In Private Credit Fund [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 13,745 | 11,719
Equity Securities [Member] | Partnership Interest In Private Credit Fund [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Partnership Interest In Private Credit Fund [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Partnership Interest In Private Credit Fund [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 13,745 | 11,719
Short-term Investments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 72,163 | 88,361
Short-term Investments [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 69,996 | 69,999
Short-term Investments [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 2,167 | 18,362
Short-term Investments [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Money Market Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 81,385 | 284,181
Money Market Funds [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 81,385 | 284,181
Money Market Funds [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Money Market Funds [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Total Return Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, Fair Value Disclosure, Recurring | 1,564 | 4,025
Total Return Swap [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, Fair Value Disclosure, Recurring | 0 | 0
Total Return Swap [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, Fair Value Disclosure, Recurring | 1,564 | 4,025
Total Return Swap [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, Fair Value Disclosure, Recurring | 0 | 0
Equity Contract [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, Fair Value Disclosure, Recurring | 51 | 194
Equity Contract [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, Fair Value Disclosure, Recurring | 51 | 194
Equity Contract [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, Fair Value Disclosure, Recurring | 0 | 0
Equity Contract [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, Fair Value Disclosure, Recurring | $ 0 | $ 0

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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