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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2016
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |
Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Valuation Techniques | The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis, and indicate the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair values:
| December 31, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Amounts in thousands)
Assets |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |
U.S. government bonds and agencies | $ | 12,275 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,275 |
Municipal securities | — |  |  | 2,449,292 |  |  | — |  |  | 2,449,292 |
Mortgage-backed securities | — |  |  | 39,777 |  |  | — |  |  | 39,777 |
Corporate securities | — |  |  | 189,688 |  |  | — |  |  | 189,688 |
Collateralized loan obligations | — |  |  | 86,525 |  |  | — |  |  | 86,525 |
Other asset-backed securities | — |  |  | 36,996 |  |  | — |  |  | 36,996 |
Equity securities: |  |  |  |  |  |  |
Common stock | 316,450 |  |  | — |  |  | — |  |  | 316,450 |
Non-redeemable preferred stock | — |  |  | 31,809 |  |  | — |  |  | 31,809 |
Private equity funds | — |  |  | — |  |  | 9,068 |  |  | 9,068 |
Short-term investments: |  |  |  |  |  |  |
Short-term bonds | 70,393 |  |  | 20,233 |  |  | — |  |  | 90,626 |
Money market instruments | 285,054 |  |  | — |  |  | — |  |  | 285,054 |
Other assets: |  |  |  |  |  |  |
Total return swaps | — |  |  | 667 |  |  | — |  |  | 667 |
Total assets at fair value | $ | 684,172 |  |  | $ | 2,854,987 |  |  | $ | 9,068 |  |  | $ | 3,548,227 |
Liabilities |  |  |  |  |  |  |
Notes payable: |  |  |  |  |  |  |
Secured notes | $ | — |  |  | $ | 140,000 |  |  | $ | — |  |  | $ | 140,000 |
Unsecured notes | — |  |  | 180,000 |  |  | — |  |  | 180,000 |
Other liabilities: |  |  |  |  |  |  |
Total return swaps | — |  |  | 765 |  |  | — |  |  | 765 |
Options sold | 20 |  |  | — |  |  | — |  |  | 20 |
Total liabilities at fair value | $ | 20 |  |  | $ | 320,765 |  |  | $ | — |  |  | $ | 320,785 |
| December 31, 2015
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Amounts in thousands)
Assets |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |
U.S. government bonds and agencies | $ | 22,507 |  |  | $ | — |  |  | $ | — |  |  | $ | 22,507 |
Municipal securities | — |  |  | 2,505,040 |  |  | — |  |  | 2,505,040 |
Mortgage-backed securities | — |  |  | 49,838 |  |  | — |  |  | 49,838 |
Corporate securities | — |  |  | 243,372 |  |  | — |  |  | 243,372 |
Collateralized debt obligations | — |  |  | 50,548 |  |  | — |  |  | 50,548 |
Other asset-backed securities | — |  |  | 8,698 |  |  | — |  |  | 8,698 |
Equity securities: |  |  |  |  |  |  |
Common stock | 280,263 |  |  | — |  |  | — |  |  | 280,263 |
Non-redeemable preferred stock | — |  |  | 24,668 |  |  | — |  |  | 24,668 |
Private equity funds | — |  |  | — |  |  | 10,431 |  |  | 10,431 |
Short-term investments: |  |  |  |  |  |  |
Short-term bonds | 69,991 |  |  | 9,850 |  |  | — |  |  | 79,841 |
Money market instruments | 105,436 |  |  | — |  |  | — |  |  | 105,436 |
Total assets at fair value | $ | 478,197 |  |  | $ | 2,892,014 |  |  | $ | 10,431 |  |  | $ | 3,380,642 |
Liabilities |  |  |  |  |  |  |
Notes payable: |  |  |  |  |  |  |
Secured notes | $ | — |  |  | $ | 140,000 |  |  | $ | — |  |  | $ | 140,000 |
Unsecured notes | — |  |  | 150,000 |  |  | — |  |  | 150,000 |
Other liabilities: |  |  |  |  |  |  |
Total return swaps | — |  |  | 11,525 |  |  | — |  |  | 11,525 |
Options sold | 260 |  |  | — |  |  | — |  |  | 260 |
Total liabilities at fair value | $ | 260 |  |  | $ | 301,525 |  |  | $ | — |  |  | $ | 301,785 |
Summary Of Changes In Fair Value Of Level 3 Financial Assets And Financial Liabilities Held At Fair Value | The following table presents a summary of changes in fair value of Level 3 financial assets:
|  | Private Equity Funds
|  | Year Ended December 31,
|  | 2016 |  | 2015
|  | (Amounts in thousands)
Beginning balance |  | $ | 10,431 |  |  | $ | 11,719 |
Realized losses included in earnings |  | (1,363 | ) |  | (4,175 | )
Reclassification from other assets |  | — |  |  | 2,911 |
Sales |  | — |  |  | — |
Settlements |  | — |  |  | (24 | )
Ending balance |  | $ | 9,068 |  |  | $ | 10,431 |
The amount of total losses for the period included in earnings attributable to assets still held at December 31 |  | $ | (1,363 | ) |  | $ | (5,385 | )

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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