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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 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | $ 3,600,498 | $ 3,548,227
Liabilities | 1,690 | 785
Notes payable | 371,044 | 320,000
Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 636,248 | 684,172
Liabilities | 285 | 20
Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 2,955,232 | 2,854,987
Liabilities | 1,405 | 765
Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 9,018 | 9,068
Liabilities | 0 | 0
Fixed maturity securities [Member] | U.S. Government Bonds and Agencies [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 12,271 | 12,275
Fixed maturity securities [Member] | Municipal Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 2,561,428 | 2,449,292
Fixed maturity securities [Member] | Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 37,847 | 39,777
Fixed maturity securities [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 165,761 | 189,688
Fixed maturity securities [Member] | Collateralized Loan Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 89,790 | 86,525
Fixed maturity securities [Member] | Other Asset-Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 47,190 | 36,996
Fixed maturity securities [Member] | Level 1 [Member] | U.S. Government Bonds and Agencies [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 12,271 | 12,275
Fixed maturity securities [Member] | Level 1 [Member] | Municipal Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Fixed maturity securities [Member] | Level 1 [Member] | Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Fixed maturity securities [Member] | Level 1 [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Fixed maturity securities [Member] | Level 1 [Member] | Collateralized Loan Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Fixed maturity securities [Member] | Level 1 [Member] | Other Asset-Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Fixed maturity securities [Member] | Level 2 [Member] | U.S. Government Bonds and Agencies [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Fixed maturity securities [Member] | Level 2 [Member] | Municipal Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 2,561,428 | 2,449,292
Fixed maturity securities [Member] | Level 2 [Member] | Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 37,847 | 39,777
Fixed maturity securities [Member] | Level 2 [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 165,761 | 189,688
Fixed maturity securities [Member] | Level 2 [Member] | Collateralized Loan Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 89,790 | 86,525
Fixed maturity securities [Member] | Level 2 [Member] | Other Asset-Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 47,190 | 36,996
Fixed maturity securities [Member] | Level 3 [Member] | U.S. Government Bonds and Agencies [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Municipal Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Collateralized Loan Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Other Asset-Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 383,529 | 316,450
Equity Securities [Member] | Nonredeemable Preferred Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 32,959 | 31,809
Equity Securities [Member] | Private Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 9,018 | 9,068
Equity Securities [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 383,529 | 316,450
Equity Securities [Member] | Level 1 [Member] | Nonredeemable Preferred Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Equity Securities [Member] | Level 1 [Member] | Private Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Equity Securities [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Equity Securities [Member] | Level 2 [Member] | Nonredeemable Preferred Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 32,959 | 31,809
Equity Securities [Member] | Level 2 [Member] | Private Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Equity Securities [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Equity Securities [Member] | Level 3 [Member] | Nonredeemable Preferred Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Equity Securities [Member] | Level 3 [Member] | Private Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 9,018 | 9,068
Short-term Investments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 90,215 | 90,626
Short-term Investments [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 69,958 | 70,393
Short-term Investments [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 20,257 | 20,233
Short-term Investments [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Money Market Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 170,490 | 285,054
Money Market Funds [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 170,490 | 285,054
Money Market Funds [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Money Market Funds [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Total Return Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets |  | 667
Liabilities | 1,405 | 765
Total Return Swap [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets |  | 0
Liabilities | 0 | 0
Total Return Swap [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets |  | 667
Liabilities | 1,405 | 765
Total Return Swap [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets |  | 0
Liabilities | 0 | 0
Equity Contract [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 285 | 20
Equity Contract [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 285 | 20
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
Unsecured debt [Member] | Borrowings [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 374,633 | 180,000
Notes payable | 371,044 | 180,000
Unsecured debt [Member] | Borrowings [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 374,633 | 180,000
Unsecured debt [Member] | Borrowings [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Secured Debt [Member] | Borrowings [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | $ 0 | 140,000
Notes payable |  | 140,000
Secured Debt [Member] | Borrowings [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities |  | 0
Secured Debt [Member] | Borrowings [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities |  | 140,000
Secured Debt [Member] | Borrowings [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities |  | $ 0

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