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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for credit losses, Period beginning balance | $ 9,724 | $ 3,969 |
Allowance for credit losses, Period ending balance | 37,599 | 8,781 |
Accrued investment income | 48,427 |  | $ 48,247
Current provision for securities without prior allowance | 18,588 | 5,667 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | 3,463 | (677) |
Reductions for securities sold | (1,395) | (178) |
Reductions for securities identified as intent (or requirement) to sell during the period | (1,099) | 0 |
Debt Securities, Available-for-sale, Fair Value | 6,598,822 |  | 6,709,976
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 61,993 |  | 246,301
Fixed income securities, available-for-sale, amortized cost | 6,717,907 |  | 6,490,753
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 143,479 |  | 17,354
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 8,318 |  |
Available-for-sale Securities | U.S. Government and Government Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for credit losses, Period beginning balance | 0 |  |
Allowance for credit losses, Period ending balance | 0 |  |
Debt Securities, Available-for-sale, Fair Value | 127,093 |  | 130,458
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 490 |  | 3,629
Fixed income securities, available-for-sale, amortized cost | 131,986 |  | 127,974
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 5,383 |  | 1,145
Available-for-sale Securities | Foreign Government [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for credit losses, Period beginning balance | 46 | 1 |
Allowance for credit losses, Period ending balance | 150 | 56 |
Current provision for securities without prior allowance | 103 | 56 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | 1 | (1) |
Reductions for securities sold | 0 | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Debt Securities, Available-for-sale, Fair Value | 16,703 |  | 15,860
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 145 |  | 609
Fixed income securities, available-for-sale, amortized cost | 17,160 |  | 15,420
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 452 |  | 123
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 |  |
Available-for-sale Securities | Obligations of States and Political Subdivisions [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for credit losses, Period beginning balance | 137 | 4 |
Allowance for credit losses, Period ending balance | 1,991 | 201 |
Current provision for securities without prior allowance | 1,732 | 186 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | 132 | 11 |
Reductions for securities sold | (10) | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Debt Securities, Available-for-sale, Fair Value | 1,125,431 |  | 1,189,308
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 15,329 |  | 68,258
Fixed income securities, available-for-sale, amortized cost | 1,122,132 |  | 1,121,422
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 10,039 |  | 235
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 |  |
Available-for-sale Securities | Corporate Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for credit losses, Period beginning balance | 6,682 | 2,782 |
Allowance for credit losses, Period ending balance | 23,066 | 6,166 |
Current provision for securities without prior allowance | 15,393 | 4,058 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | 3,337 | (527) |
Reductions for securities sold | (1,247) | (147) |
Reductions for securities identified as intent (or requirement) to sell during the period | (1,099) | 0 |
Debt Securities, Available-for-sale, Fair Value | 2,387,740 |  | 2,573,603
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 25,658 |  | 106,890
Fixed income securities, available-for-sale, amortized cost | 2,445,468 |  | 2,478,348
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 60,320 |  | 4,953
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 |  |
Available-for-sale Securities | Collateralized Loan Obligations and Other Asset Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for credit losses, Period beginning balance | 939 | 592 |
Allowance for credit losses, Period ending balance | 2,283 | 1,470 |
Current provision for securities without prior allowance | 1,288 | 1,001 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | 59 | (106) |
Reductions for securities sold | (3) | (17) |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Debt Securities, Available-for-sale, Fair Value | 1,417,214 |  | 1,350,814
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7,974 |  | 14,350
Fixed income securities, available-for-sale, amortized cost | 1,444,224 |  | 1,343,687
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 32,701 |  | 6,284
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 |  |
Available-for-sale Securities | Residential Mortgage Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for credit losses, Period beginning balance | 1,909 | 561 |
Allowance for credit losses, Period ending balance | 10,029 | 864 |
Current provision for securities without prior allowance | 0 | 356 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (63) | (39) |
Reductions for securities sold | (135) | (14) |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Debt Securities, Available-for-sale, Fair Value | 877,959 |  | 776,252
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6,779 |  | 24,813
Fixed income securities, available-for-sale, amortized cost | 903,800 |  | 756,280
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 22,591 |  | 2,932
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 8,318 |  |
Available-for-sale Securities | Commercial Mortgage Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for credit losses, Period beginning balance | 11 | 29 |
Allowance for credit losses, Period ending balance | 80 | 24 |
Current provision for securities without prior allowance | 72 | 10 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (3) | (15) |
Reductions for securities sold | 0 | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | $ 0 |
Debt Securities, Available-for-sale, Fair Value | 646,682 |  | 673,681
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5,618 |  | 27,752
Fixed income securities, available-for-sale, amortized cost | 653,137 |  | 647,622
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 11,993 |  | 1,682
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 |  |
Available-for-sale Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Accrued investment income | $ 46,800 |  | $ 46,300

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