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Fair Value (Tables) | 9 Months Ended
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Sep. 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) |  | September 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 |  | $ | 1,239,400 |  | $ | - |  | $ | 1,239,400 |  | $ | -
Obligations of U.S. States and political subdivisions |  |  | 537,371 |  |  | - |  |  | 537,371 |  |  | -
Corporate securities |  |  | 6,475,337 |  |  | - |  |  | 5,887,290 |  |  | 588,047
Asset-backed securities |  |  | 864,886 |  |  | - |  |  | 824,242 |  |  | 40,644
Mortgage-backed securities |  |  | - |  |  |  |  |  |  |  |  |
Commercial |  |  | 767,292 |  |  | - |  |  | 767,292 |  |  | -
Agency residential |  |  | 2,401,616 |  |  | - |  |  | 2,401,616 |  |  | -
Non-agency residential |  |  | 8,067 |  |  | - |  |  | 8,067 |  |  | -
Foreign government securities |  |  | 1,343,563 |  |  | - |  |  | 1,343,563 |  |  | -
Foreign corporate securities |  |  | 2,928,601 |  |  | - |  |  | 2,926,508 |  |  | 2,093
Total fixed maturities, market value |  |  | 16,566,133 |  |  | - |  |  | 15,935,349 |  |  | 630,784
Fixed maturities, fair value |  |  | - |  |  | - |  |  | - |  |  | -
Equity securities, fair value |  |  | 906,230 |  |  | 814,833 |  |  | 91,397 |  |  | -
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Equity index put option contracts |  | $ | 8,563 |  | $ | - |  | $ | - |  | $ | 8,563
|  |  |  |  |  | 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
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 September 30, 2019 |  | Nine Months Ended September 30, 2019
|  | Corporate |  | Asset-Backed |  | Foreign |  |  |  |  | Corporate |  | Asset-Backed |  | Foreign |  |  |
(Dollars in thousands) |  | Securities |  | Securities |  | Corporate |  | Total |  | Securities |  | Securities |  | Corporate |  | Total
Beginning balance fixed maturities at market value |  | $ | 542,878 |  | $ | - |  | $ | 2,093 |  | $ | 544,971 |  | $ | 428,215 |  | $ | - |  | $ | 7,744 |  | $ | 435,959
Total gains or (losses) (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | 1,018 |  |  | - |  |  | - |  |  | 1,018 |  |  | 3,348 |  |  | - |  |  | (119) |  |  | 3,229
Included in other comprehensive income (loss) |  |  | (1,314) |  |  | 644 |  |  | - |  |  | (670) |  |  | 1,130 |  |  | 644 |  |  | - |  |  | 1,774
Purchases, issuances and settlements |  |  | 42,289 |  |  | 40,000 |  |  | - |  |  | 82,289 |  |  | 150,659 |  |  | 40,000 |  |  | (5,532) |  |  | 185,127
Transfers in and/or (out) of Level 3 |  |  | 3,176 |  |  | - |  |  | - |  |  | 3,176 |  |  | 4,695 |  |  | - |  |  | - |  |  | 4,695
Ending balance |  | $ | 588,047 |  | $ | 40,644 |  | $ | 2,093 |  | $ | 630,784 |  | $ | 588,047 |  | $ | 40,644 |  | $ | 2,093 |  | $ | 630,784
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 September 30, 2018 |  |  | Nine Months Ended September 30, 2018
|  | Corporate |  | Foreign |  |  |  |  | Corporate |  | Foreign |  |  |
(Dollars in thousands) |  | Securities |  |  | Corporate |  | Total |  | Securities |  | Corporate |  | Total
Beginning balance fixed maturities at market value |  | $ | 381,215 |  | $ | 12,615 |  | $ | 393,830 |  | $ | 210,186 |  | $ | 6,952 |  | $ | 217,138
Total gains or (losses) (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | (1,937) |  |  | (472) |  |  | (2,409) |  |  | (591) |  |  | (882) |  |  | (1,473)
Included in other comprehensive income (loss) |  |  | (449) |  |  | - |  |  | (449) |  |  | (24) |  |  | - |  |  | (24)
Purchases, issuances and settlements |  |  | 50,290 |  |  | 18 |  |  | 50,308 |  |  | 219,548 |  |  | 4,341 |  |  | 223,889
Transfers in and/or (out) of Level 3 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 1,750 |  |  | 1,750
Ending balance |  | $ | 429,119 |  | $ | 12,161 |  | $ | 441,280 |  | $ | 429,119 |  | $ | 12,161 |  | $ | 441,280
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 September 30, 2019 | Nine Months Ended September 30, 2019
|  | Foreign |  |  |  |  | Foreign |  |  |
(Dollars in thousands) |  |  | Corporate |  | Total |  | Corporate |  | Total
Beginning balance fixed maturities at market value |  | $ | - |  | $ | - |  | $ | 2,337 |  | $ | 2,337
Total gains or (losses) (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | - |  |  | - |  |  | 369 |  |  | 369
Included in other comprehensive income (loss) |  |  | - |  |  | - |  |  | - |  |  | -
Purchases, issuances and settlements |  |  | - |  |  | - |  |  | (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, Fair Value
| Three Months Ended September 30, 2018 | Nine Months Ended September 30, 2018
|  | Foreign |  |  |  |  | Foreign |  |  |
(Dollars in thousands) |  |  | Corporate |  | Total |  | Corporate |  | Total
Beginning balance fixed maturities at market value |  | $ | 3,192 |  | $ | 3,192 |  | $ | - |  | $ | -
Total gains or (losses) (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  | (101) |  |  | (101) |  |  | (257) |  |  | (257)
Included in other comprehensive income (loss) |  |  | (32) |  |  | (32) |  |  | - |  |  | -
Purchases, issuances and settlements |  |  | (686) |  |  | (686) |  |  | 2,630 |  |  | 2,630
Transfers in and/or (out) of Level 3 |  |  | - |  |  | - |  |  | - |  |  | -
Ending balance |  | $ | 2,373 |  | $ | 2,373 |  | $ | 2,373 |  | $ | 2,373
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 |  | Nine Months Ended
| September 30, |  | September 30,
(Dollars in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ | 8,374 |  | $ | 9,218 |  | $ | 11,958 |  | $ | 12,477
Total (gains) or losses (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  | 189 |  |  | (2,225) |  |  | (3,395) |  |  | (5,485)
Included in other comprehensive income (loss) |  | - |  |  | - |  |  | - |  |  | -
Purchases, issuances and settlements |  | - |  |  | - |  |  | - |  |  | -
Transfers in and/or (out) of Level 3 |  | - |  |  | - |  |  | - |  |  | -
Balance, end of period | $ | 8,563 |  | $ | 6,993 |  | $ | 8,563 |  | $ | 6,993
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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