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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 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | $ 3,554,236 | $ 3,380,642
Liabilities | 293,407 | 301,785
Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 531,448 | 478,197
Liabilities | 122 | 260
Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 3,013,252 | 2,892,014
Liabilities | 293,285 | 301,525
Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 9,536 | 10,431
Liabilities | 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 | 12,862 | 22,507
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 | 2,586,211 | 2,505,040
Fixed maturity securities [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 41,101 | 49,838
Fixed maturity securities [Member] | Corporate Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 211,592 | 243,372
Fixed maturity securities [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 82,521 | 50,548
Fixed maturity securities [Member] | Collateralized Auto Loans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 38,640 | 8,698
Fixed maturity securities [Member] | Level 1 [Member] | US Treasury and Government [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 12,862 | 22,507
Fixed maturity securities [Member] | Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Level 1 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Level 1 [Member] | Corporate Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Level 1 [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Level 1 [Member] | Collateralized Auto Loans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Level 2 [Member] | US Treasury and Government [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 2,586,211 | 2,505,040
Fixed maturity securities [Member] | Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 41,101 | 49,838
Fixed maturity securities [Member] | Level 2 [Member] | Corporate Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 211,592 | 243,372
Fixed maturity securities [Member] | Level 2 [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 82,521 | 50,548
Fixed maturity securities [Member] | Level 2 [Member] | Collateralized Auto Loans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 38,640 | 8,698
Fixed maturity securities [Member] | Level 3 [Member] | US Treasury and Government [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Corporate Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Collateralized Auto Loans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Common Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 331,842 | 280,263
Equity Securities [Member] | Nonredeemable Preferred Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 33,080 | 24,668
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 | 9,536 | 10,431
Equity Securities [Member] | Level 1 [Member] | Common Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 331,842 | 280,263
Equity Securities [Member] | Level 1 [Member] | Nonredeemable Preferred Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Level 1 [Member] | Partnership Interest In Private Credit Fund [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Level 2 [Member] | Common Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Level 2 [Member] | Nonredeemable Preferred Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 33,080 | 24,668
Equity Securities [Member] | Level 2 [Member] | Partnership Interest In Private Credit Fund [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Level 3 [Member] | Common Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Level 3 [Member] | Nonredeemable Preferred Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Equity Securities [Member] | Level 3 [Member] | Partnership Interest In Private Credit Fund [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 9,536 | 10,431
Short-term Investments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 90,512 | 79,841
Short-term Investments [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 70,405 | 69,991
Short-term Investments [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 20,107 | 9,850
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 | 116,339 | 105,436
Money Market Funds [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 116,339 | 105,436
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
Borrowings [Members] | Secured Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 140,000 | 140,000
Borrowings [Members] | Unsecured Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 150,000 | 150,000
Borrowings [Members] | Level 1 [Member] | Secured Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Borrowings [Members] | Level 1 [Member] | Unsecured Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Borrowings [Members] | Level 2 [Member] | Secured Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 140,000 |
Borrowings [Members] | Level 2 [Member] | Unsecured Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 150,000 |
Borrowings [Members] | Level 3 [Member] | Secured Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Borrowings [Members] | Level 3 [Member] | Unsecured Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Total Return Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 3,285 | 11,525
Total Return Swap [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Total Return Swap [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 3,285 | 11,525
Total Return Swap [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Equity Contract [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 122 | 260
Equity Contract [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 122 | 260
Equity Contract [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Equity Contract [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | $ 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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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
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