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Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value [Abstract] |
Fair Value Measurement Levels For All Assets And Liabilities |
|  |  |  |  | Fair Value Measurement Using: |
|  |  |  |  | Quoted Prices |  |  |  |  |  |  |
|  |  |  |  | in Active |  |  | Significant |  |  |  |
|  |  |  |  | Markets for |  |  | Other |  |  | Significant |
|  |  |  |  | Identical |  |  | Observable |  |  | Unobservable |
|  |  |  |  | Assets |  |  | Inputs |  |  | Inputs |
(Dollars in thousands) |  | March 31, 2019 |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturities, market value |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies and corporations |  | $ | 1,297,113 |  |  | $ | - |  |  | $ | 1,297,113 |  |  | $ | - |
Obligations of U.S. States and political subdivisions |  |  | 504,858 |  |  |  | - |  |  |  | 504,858 |  |  |  | - |
Corporate securities |  |  | 6,016,532 |  |  |  | - |  |  |  | 5,578,706 |  |  |  | 437,826 |
Asset-backed securities |  |  | 717,165 |  |  |  | - |  |  |  | 717,165 |  |  |  | - |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  |  | 531,508 |  |  |  | - |  |  |  | 531,508 |  |  |  | - |
Agency residential |  |  | 2,347,278 |  |  |  | - |  |  |  | 2,347,278 |  |  |  | - |
Non-agency residential |  |  | 9,766 |  |  |  | - |  |  |  | 9,766 |  |  |  | - |
Foreign government securities |  |  | 1,298,136 |  |  |  | - |  |  |  | 1,298,136 |  |  |  | - |
Foreign corporate securities |  |  | 2,790,931 |  |  |  | - |  |  |  | 2,783,633 |  |  |  | 7,298 |
Total fixed maturities, market value |  |  | 15,513,287 |  |  |  | - |  |  |  | 15,068,163 |  |  |  | 445,124 |
Fixed maturities, fair value |  |  | 2,350 |  |  |  | - |  |  |  | - |  |  |  | 2,350 |
Equity securities, fair value |  |  | 883,191 |  |  |  | 833,414 |  |  |  | 49,777 |  |  |  | - |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity index put option contracts |  | $ | 8,727 |  |  | $ | - |  |  | $ | - |  |  | $ | 8,727 |
|  |  |  |  | Fair Value Measurement Using: |
|  |  |  |  | Quoted Prices |  |  |  |  |  |  |
|  |  |  |  | in Active |  |  | Significant |  |  |  |
|  |  |  |  | Markets for |  |  | Other |  |  | Significant |
|  |  |  |  | Identical |  |  | Observable |  |  | Unobservable |
|  |  |  |  | Assets |  |  | Inputs |  |  | Inputs |
(Dollars in thousands) |  | December 31, 2018 |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturities, market value |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies and corporations |  | $ | 2,631,134 |  |  | $ | - |  |  | $ | 2,631,134 |  |  | $ | - |
Obligations of U.S. States and political subdivisions |  |  | 500,094 |  |  |  | - |  |  |  | 500,094 |  |  |  | - |
Corporate securities |  |  | 5,445,532 |  |  |  | - |  |  |  | 5,017,317 |  |  |  | 428,215 |
Asset-backed securities |  |  | 540,097 |  |  |  | - |  |  |  | 540,097 |  |  |  | - |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  |  | 326,710 |  |  |  | - |  |  |  | 326,710 |  |  |  | - |
Agency residential |  |  | 1,796,264 |  |  |  | - |  |  |  | 1,796,264 |  |  |  | - |
Non-agency residential |  |  | 10,209 |  |  |  | - |  |  |  | 10,209 |  |  |  | - |
Foreign government securities |  |  | 1,314,165 |  |  |  | - |  |  |  | 1,314,165 |  |  |  | - |
Foreign corporate securities |  |  | 2,661,058 |  |  |  | - |  |  |  | 2,653,314 |  |  |  | 7,744 |
Total fixed maturities, market value |  |  | 15,225,263 |  |  |  | - |  |  |  | 14,789,304 |  |  |  | 435,959 |
Equity securities, market value |  |  | 2,337 |  |  |  | - |  |  |  | - |  |  |  | 2,337 |
Equity securities, fair value |  |  | 716,639 |  |  |  | 674,433 |  |  |  | 42,206 |  |  |  | - |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity index put option contracts |  | $ | 11,958 |  |  | $ | - |  |  | $ | - |  |  | $ | 11,958 |
Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type |
|  | Total Fixed Maturities, Market Value |
|  | Three Months Ended March 31, 2019 |  |  | Three Months Ended March 31, 2018 |
|  | Corporate |  |  | Foreign |  |  |  |  |  | Corporate |  |  | Foreign |  |  |  |
(Dollars in thousands) |  | Securities |  |  | Corporate |  |  | Total |  |  | Securities |  |  | Corporate |  |  | Total |
Beginning balance fixed maturities at market value |  | $ | 428,215 |  |  | $ | 7,744 |  |  | $ | 435,959 |  |  | $ | 210,186 |  |  | $ | 6,952 |  |  | $ | 217,138 |
Total gains or (losses) (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | 4,858 |  |  |  | 119 |  |  |  | 4,977 |  |  |  | 722 |  |  |  | 94 |  |  |  | 816 |
Included in other comprehensive income (loss) |  |  | 573 |  |  |  | - |  |  |  | 573 |  |  |  | 235 |  |  |  | - |  |  |  | 235 |
Purchases, issuances and settlements |  |  | 6,638 |  |  |  | (565 | ) |  |  | 6,073 |  |  |  | 9,412 |  |  |  | 4,322 |  |  |  | 13,734 |
Transfers in and/or (out) of Level 3 |  |  | (2,458 | ) |  |  | - |  |  |  | (2,458 | ) |  |  | - |  |  |  | - |  |  |  | - |
Ending balance |  | $ | 437,826 |  |  | $ | 7,298 |  |  | $ | 445,124 |  |  | $ | 220,555 |  |  | $ | 11,368 |  |  | $ | 231,923 |
The amount of total gains or losses for the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
included in earnings (or changes in net assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
attributable to the change in unrealized gains |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
or losses relating to assets still held |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
at the reporting date |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
(Some amounts may not reconcile due to rounding.) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Total Fixed Maturities, Fair Value |
|  | Three Months Ended March 31, 2019 |  |  | Three Months Ended March 31, 2018 |
|  | Foreign |  |  |  |  |  | Foreign |  |  |  |
(Dollars in thousands) |  | Corporate |  |  | Total |  |  | Corporate |  |  | Total |
Beginning balance fixed maturities at fair value |  | $ | 2,337 |  |  | $ | 2,337 |  |  | $ | - |  |  | $ | - |
Total gains or (losses) (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | 13 |  |  |  | 13 |  |  |  | (14 | ) |  |  | (14 | )
Included in other comprehensive income (loss) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Purchases, issuances and settlements |  |  | - |  |  |  | - |  |  |  | 1,835 |  |  |  | 1,835 |
Transfers in and/or (out) of Level 3 |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Ending balance |  | $ | 2,350 |  |  | $ | 2,350 |  |  | $ | 1,821 |  |  | $ | 1,821 |
The amount of total gains or losses for the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
included in earnings (or changes in net assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
attributable to the change in unrealized gains |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
or losses relating to assets still held |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
at the reporting date |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
(Some amounts may not reconcile due to rounding.) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts |
|  | Three Months Ended |
|  | March 31, |
(Dollars in thousands) |  | 2019 |  |  | 2018 |
Liabilities: |  |  |  |  |  |
Balance, beginning of period |  | $ | 11,958 |  |  | $ | 12,477 |
Total (gains) or losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings |  |  | (3,231 | ) |  |  | (273 | )
Included in other comprehensive income (loss) |  |  | - |  |  |  | - |
Purchases, issuances and settlements |  |  | - |  |  |  | - |
Transfers in and/or (out) of Level 3 |  |  | - |  |  |  | - |
Balance, end of period |  | $ | 8,727 |  |  | $ | 12,205 |
The amount of total gains or losses for the period included in earnings |  |  |  |  |  |  |  |
(or changes in net assets) attributable to the change in unrealized |  |  |  |  |  |  |  |
gains or losses relating to liabilities still held at the reporting date |  | $ | - |  |  | $ | - |
(Some amounts may not reconcile due to rounding.) |  |  |  |  |  |  |  |

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