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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, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | $ 3,659,158 | $ 3,548,227
Liabilities, fair value | 1,829 | 785
Notes payable | 371,136 | 320,000
Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 668,300 | 684,172
Liabilities, fair value | 104 | 20
Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 2,982,094 | 2,854,987
Liabilities, fair value | 1,725 | 765
Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 8,764 | 9,068
Liabilities, fair value | 0 | 0
Fixed maturity securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 2,952,084 | 2,814,553
Fixed maturity securities [Member] | U.S. Government Bonds and Agencies [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 11,735 | 12,275
Fixed maturity securities [Member] | Municipal Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 2,603,646 | 2,449,292
Fixed maturity securities [Member] | Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 33,551 | 39,777
Fixed maturity securities [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 165,880 | 189,688
Fixed maturity securities [Member] | Collateralized Loan Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 83,465 | 86,525
Fixed maturity securities [Member] | Other Asset-Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 53,807 | 36,996
Fixed maturity securities [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 11,735 | 12,275
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, fair value | 11,735 | 12,275
Fixed maturity securities [Member] | Level 1 [Member] | Municipal Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Fixed maturity securities [Member] | Level 1 [Member] | Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Fixed maturity securities [Member] | Level 1 [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Fixed maturity securities [Member] | Level 1 [Member] | Collateralized Loan Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 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, fair value | 0 | 0
Fixed maturity securities [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 2,940,349 | 2,802,278
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, fair value | 0 | 0
Fixed maturity securities [Member] | Level 2 [Member] | Municipal Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 2,603,646 | 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, fair value | 33,551 | 39,777
Fixed maturity securities [Member] | Level 2 [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 165,880 | 189,688
Fixed maturity securities [Member] | Level 2 [Member] | Collateralized Loan Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 83,465 | 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, fair value | 53,807 | 36,996
Fixed maturity securities [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
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, fair value | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Municipal Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Fixed maturity securities [Member] | Level 3 [Member] | Collateralized Loan Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 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, fair value | 0 | 0
Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 427,029 | 357,327
Equity Securities [Member] | Common Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 392,514 | 316,450
Equity Securities [Member] | Nonredeemable Preferred Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 25,751 | 31,809
Equity Securities [Member] | Private Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 8,764 | 9,068
Equity Securities [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 392,514 | 316,450
Equity Securities [Member] | Level 1 [Member] | Common Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 392,514 | 316,450
Equity Securities [Member] | Level 1 [Member] | Nonredeemable Preferred Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Equity Securities [Member] | Level 1 [Member] | Private Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Equity Securities [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 25,751 | 31,809
Equity Securities [Member] | Level 2 [Member] | Common Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 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 | 25,751 | 31,809
Equity Securities [Member] | Level 2 [Member] | Private Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Equity Securities [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 8,764 | 9,068
Equity Securities [Member] | Level 3 [Member] | Common Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 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 | 0 | 0
Equity Securities [Member] | Level 3 [Member] | Private Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 8,764 | 9,068
Short-term Investments [Member] | Short-term Bonds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 45,991 | 90,626
Short-term Investments [Member] | Level 1 [Member] | Short-term Bonds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 29,997 | 70,393
Short-term Investments [Member] | Level 2 [Member] | Short-term Bonds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 15,994 | 20,233
Short-term Investments [Member] | Level 3 [Member] | Short-term Bonds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Money Market Instruments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 280,045 | 375,680
Money Market Instruments [Member] | Money Market Instruments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 234,054 | 285,054
Money Market Instruments [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 264,051 | 355,447
Money Market Instruments [Member] | Level 1 [Member] | Money Market Instruments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 234,054 | 285,054
Money Market Instruments [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 15,994 | 20,233
Money Market Instruments [Member] | Level 2 [Member] | Money Market Instruments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Money Market Instruments [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Money Market Instruments [Member] | Level 3 [Member] | Money Market Instruments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Total Return Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value |  | 667
Liabilities, fair value | 1,725 | 765
Total Return Swap [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value |  | 0
Liabilities, fair value | 0 | 0
Total Return Swap [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value |  | 667
Liabilities, fair value | 1,725 | 765
Total Return Swap [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value |  | 0
Liabilities, fair value | 0 | 0
Equity contracts [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, fair value | 104 | 20
Equity contracts [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, fair value | 104 | 20
Equity contracts [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, fair value | 0 | 0
Equity contracts [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, fair value | 0 | 0
Unsecured debt [Member] | Borrowings [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, fair value | 380,059 | 180,000
Notes payable | 371,136 | 180,000
Unsecured debt [Member] | Borrowings [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, fair value | 0 | 0
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, fair value | 380,059 | 180,000
Unsecured debt [Member] | Borrowings [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, fair value | 0 | 0
Secured Debt [Member] | Borrowings [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, fair value | $ 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, fair value |  | 0
Secured Debt [Member] | Borrowings [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, fair value |  | 140,000
Secured Debt [Member] | Borrowings [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, fair value |  | $ 0

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