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Fair Value Measurement (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Valuation Techniques) (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | $ 3,732,917,000 | $ 3,548,227,000
Liabilities, fair value | 1,735,000 | 785,000
Notes payable | 371,236,000 | 320,000,000
Money Market Instruments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 366,402,000 | 375,680,000
Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 772,235,000 | 684,172,000
Liabilities, fair value | 146,000 | 20,000
Level 1 [Member] | Money Market Instruments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 347,509,000 | 355,447,000
Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 2,882,987,000 | 2,854,987,000
Liabilities, fair value | 1,589,000 | 765,000
Level 2 [Member] | Money Market Instruments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 18,893,000 | 20,233,000
Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 8,684,000 | 9,068,000
Liabilities, fair value | 0 | 0
Level 3 [Member] | Money Market Instruments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 | 0
Note Receivable [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 5,585,000 |
Note Receivable [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 |
Note Receivable [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 5,585,000 |
Note Receivable [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 0 |
Fixed maturity securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 2,841,736,000 | 2,814,553,000
Fixed maturity securities [Member] | U.S. Government Bonds and Agencies [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 13,892,000 | 12,275,000
Fixed maturity securities [Member] | Municipal Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 2,483,750,000 | 2,449,292,000
Fixed maturity securities [Member] | Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 32,726,000 | 39,777,000
Fixed maturity securities [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 161,883,000 | 189,688,000
Fixed maturity securities [Member] | Collateralized Loan Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 94,325,000 | 86,525,000
Fixed maturity securities [Member] | Other Asset-Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 55,160,000 | 36,996,000
Fixed maturity securities [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 13,892,000 | 12,275,000
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 | 13,892,000 | 12,275,000
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 | 2,827,844,000 | 2,802,278,000
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 | 2,483,750,000 | 2,449,292,000
Fixed maturity securities [Member] | Level 2 [Member] | Mortgage Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 32,726,000 | 39,777,000
Fixed maturity securities [Member] | Level 2 [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 161,883,000 | 189,688,000
Fixed maturity securities [Member] | Level 2 [Member] | Collateralized Loan Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 94,325,000 | 86,525,000
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 | 55,160,000 | 36,996,000
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 | 519,194,000 | 357,327,000
Equity Securities [Member] | Common Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 410,834,000 | 316,450,000
Equity Securities [Member] | Nonredeemable Preferred Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 30,665,000 | 31,809,000
Equity Securities [Member] | Private Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 8,684,000 | 9,068,000
Equity Securities [Member] | Private Equity Funds, Net Asset Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 69,011,000 |
Equity Securities [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 410,834,000 | 316,450,000
Equity Securities [Member] | Level 1 [Member] | Common Stock [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 410,834,000 | 316,450,000
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 | 30,665,000 | 31,809,000
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 | 30,665,000 | 31,809,000
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 | 8,684,000 | 9,068,000
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 | 8,684,000 | 9,068,000
Short-term Investments [Member] | Short-term Bonds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 48,889,000 | 90,626,000
Short-term Investments [Member] | Level 1 [Member] | Short-term Bonds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 29,996,000 | 70,393,000
Short-term Investments [Member] | Level 2 [Member] | Short-term Bonds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 18,893,000 | 20,233,000
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] | Money Market Instruments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 317,513,000 | 285,054,000
Money Market Instruments [Member] | Level 1 [Member] | Money Market Instruments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, fair value | 317,513,000 | 285,054,000
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] | 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 |  | 667,000
Liabilities, fair value | 1,589,000 | 765,000
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 |  | 667,000
Liabilities, fair value | 1,589,000 | 765,000
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 | 146,000 | 20,000
Equity contracts [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities, fair value | 146,000 | 20,000
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 | 385,733,000 | 180,000,000
Notes payable | 371,236,000 | 180,000,000
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 | 385,733,000 | 180,000,000
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 | 140,000,000
Notes payable |  | 140,000,000
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 |  | 140,000,000
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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