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Fair Value (Tables) | 6 Months Ended
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Jun. 30, 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) |  | June 30, 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 |  | $ | 1,332,205 |  | $ | - |  | $ | 1,332,205 |  | $ | -
Obligations of U.S. States and political subdivisions |  |  | 528,709 |  |  | - |  |  | 528,709 |  |  | -
Corporate securities |  |  | 6,020,450 |  |  | - |  |  | 5,477,572 |  |  | 542,878
Asset-backed securities |  |  | 759,601 |  |  | - |  |  | 759,601 |  |  | -
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  |  | 703,250 |  |  | - |  |  | 703,250 |  |  | -
Agency residential |  |  | 2,311,416 |  |  | - |  |  | 2,311,416 |  |  | -
Non-agency residential |  |  | 8,405 |  |  | - |  |  | 8,405 |  |  | -
Foreign government securities |  |  | 1,303,182 |  |  | - |  |  | 1,303,182 |  |  | -
Foreign corporate securities |  |  | 2,837,306 |  |  | - |  |  | 2,835,213 |  |  | 2,093
Total fixed maturities, market value |  |  | 15,804,524 |  |  | - |  |  | 15,259,553 |  |  | 544,971
Fixed maturities, fair value |  |  | - |  |  | - |  |  | - |  |  | -
Equity securities, fair value |  |  | 914,654 |  |  | 834,213 |  |  | 80,441 |  |  | -
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Equity index put option contracts |  | $ | 8,374 |  | $ | - |  | $ | - |  | $ | 8,374
|  |  |  |  |  | Fair Value Measurement Using:
|  |  |  |  | Quoted Prices |  |  |  |  |  |
|  |  |  |  | in Active |  | Significant |  |  |
|  |  |  |  | Markets for |  | Other |  | Significant
|  |  |  |  | Identical |  | Observable |  | Unobservable
|  |  |  |  | Assets |  | Inputs |  | Inputs
(Dollars in thousands) |  | Decemer 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
Fixed maturities, fair 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 June 30, 2019 |  |  | Six Months Ended June 30, 2019
|  | Corporate |  | Foreign |  |  |  |  | Corporate |  | Foreign |  |  |
(Dollars in thousands) |  | Securities |  |  | Corporate |  | Total |  | Securities |  | Corporate |  | Total
Beginning balance fixed maturities at market value |  | $ | 437,826 |  | $ | 7,298 |  | $ | 445,124 |  | $ | 428,215 |  | $ | 7,744 |  | $ | 435,959
Total gains or (losses) (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | (2,528) |  |  | (238) |  |  | (2,766) |  |  | 2,330 |  |  | (119) |  |  | 2,211
Included in other comprehensive income (loss) |  |  | 1,871 |  |  | - |  |  | 1,871 |  |  | 2,444 |  |  | - |  |  | 2,444
Purchases, issuances and settlements |  |  | 101,732 |  |  | (4,967) |  |  | 96,765 |  |  | 108,370 |  |  | (5,532) |  |  | 102,838
Transfers in and/or (out) of Level 3 |  |  | 3,977 |  |  | - |  |  | 3,977 |  |  | 1,519 |  |  | - |  |  | 1,519
Ending balance |  | $ | 542,878 |  | $ | 2,093 |  | $ | 544,971 |  | $ | 542,878 |  | $ | 2,093 |  | $ | 544,971
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, Market Value
|  |  | Three Months Ended June 30, 2018 |  |  | Six Months Ended June 30, 2018
|  | Corporate |  | Foreign |  |  |  |  | Corporate |  | Foreign |  |  |
(Dollars in thousands) |  | Securities |  |  | Corporate |  | Total |  | Securities |  | Corporate |  | Total
Beginning balance fixed maturities at market value |  | $ | 220,555 |  | $ | 11,368 |  | $ | 231,923 |  | $ | 210,186 |  | $ | 6,952 |  | $ | 217,138
Total gains or (losses) (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | 624 |  |  | (504) |  |  | 120 |  |  | 1,346 |  |  | (410) |  |  | 936
Included in other comprehensive income (loss) |  |  | 190 |  |  | - |  |  | 190 |  |  | 425 |  |  | - |  |  | 425
Purchases, issuances and settlements |  |  | 159,846 |  |  | 1 |  |  | 159,847 |  |  | 169,258 |  |  | 4,323 |  |  | 173,581
Transfers in and/or (out) of Level 3 |  |  | - |  |  | 1,750 |  |  | 1,750 |  |  | - |  |  | 1,750 |  |  | 1,750
Ending balance |  | $ | 381,215 |  | $ | 12,615 |  | $ | 393,830 |  | $ | 381,215 |  | $ | 12,615 |  | $ | 393,830
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, Far Value
| Three Months Ended June 30, 2019 | Six Months Ended June 30, 2019
|  | Foreign |  |  |  |  | Foreign |  |  |
(Dollars in thousands) |  |  | Corporate |  | Total |  | Corporate |  | Total
Beginning balance fixed maturities at market value |  | $ | 2,350 |  | $ | 2,350 |  | $ | 2,337 |  | $ | 2,337
Total gains or (losses) (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | 356 |  |  | 356 |  |  | 369 |  |  | 369
Included in other comprehensive income (loss) |  |  | - |  |  | - |  |  | - |  |  | -
Purchases, issuances and settlements |  |  | (2,706) |  |  | (2,706) |  |  | (2,706) |  |  | (2,706)
Transfers in and/or (out) of Level 3 |  |  | - |  |  | - |  |  | - |  |  | -
Ending balance |  | $ | - |  | $ | - |  | $ | - |  | $ | -
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, Far Value
| Three Months Ended June 30, 2018 | Six Months Ended June 30, 2018
|  | Foreign |  |  |  |  | Foreign |  |  |
(Dollars in thousands) |  |  | Corporate |  | Total |  | Corporate |  | Total
Beginning balance fixed maturities at market value |  | $ | 1,821 |  | $ | 1,821 |  | $ | - |  | $ | -
Total gains or (losses) (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | (142) |  |  | (142) |  |  | (156) |  |  | (156)
Included in other comprehensive income (loss) |  |  | 32 |  |  | 32 |  |  | 32 |  |  | 32
Purchases, issuances and settlements |  |  | 1,481 |  |  | 1,481 |  |  | 3,316 |  |  | 3,316
Transfers in and/or (out) of Level 3 |  |  | - |  |  | - |  |  | - |  |  | -
Ending balance |  | $ | 3,192 |  | $ | 3,192 |  | $ | 3,192 |  | $ | 3,192
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 |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in thousands) | 2019 |  | -2018 |  | 2019 |  | 2018
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ | 8,727 |  | $ | 12,205 |  | $ | 11,958 |  | $ | 12,477
Total (gains) or losses (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  | (353) |  |  | (2,987) |  |  | (3,584) |  |  | (3,260)
Included in other comprehensive income (loss) |  | - |  |  | - |  |  | - |  |  | -
Purchases, issuances and settlements |  | - |  |  | - |  |  | - |  |  | -
Transfers in and/or (out) of Level 3 |  | - |  |  | - |  |  | - |  |  | -
Balance, end of period | $ | 8,374 |  | $ | 9,218 |  | $ | 8,374 |  | $ | 9,218
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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