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Fair Value Measurement (Level 3 Assets and Liability) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 27,996 | $ 10,663 | $ 11,958 | $ 11,157
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Included in other comprehensive income | (7) | (64) | (73) | 61
Purchases | 26,047 | 9,413 | 62,285 | 14,241
Sales | (301) | (115) | (6,697) | (3,061)
Transfers in | 69 |  | 3,079 | 1,550
Transfers out | (15,640) | (3,089) | (32,242) | (7,138)
Ending balance | 37,523 | 16,949 | 37,523 | 16,949
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end | (640) | 143 | (775) | 151
Net investment income |  |  |  |
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Total gains (losses) realized and unrealized, included in earnings |  |  | (1) | (10)
Net realized investment gains (losses) |  |  |  |
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Total gains (losses) realized and unrealized, included in earnings | (641) | 141 | (786) | 149
Corporate Debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 15,065 | 3,117 | 3,265 | 5,079
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Included in other comprehensive income | 49 | (6) | 82 | 38
Purchases | 10,881 | 900 | 24,971 | 900
Sales | (284) | (16) | (461) | (2,173)
Transfers in | 0 |  | 858 | 945
Transfers out | (5,999) | 0 | (9,004) | (794)
Ending balance | 19,712 | 3,995 | 19,712 | 3,995
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end | 0 | 0 | 0 | 0
Corporate Debt | Net investment income |  |  |  |
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Total gains (losses) realized and unrealized, included in earnings |  |  | 1 | 0
Corporate Debt | Net realized investment gains (losses) |  |  |  |
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Total gains (losses) realized and unrealized, included in earnings | 0 | 0 | 0 | 0
Asset-backed Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 9,857 | 5,978 | 8,693 | 2,992
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Included in other comprehensive income | (74) | (58) | (171) | 23
Purchases | 12,666 | 8,513 | 28,026 | 13,341
Sales | (17) | (99) | (506) | (888)
Transfers in | 0 |  | 0 | 605
Transfers out | (7,190) | (1,378) | (20,787) | (3,107)
Ending balance | 15,242 | 12,954 | 15,242 | 12,954
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end | 0 | 0 | 0 | 0
Asset-backed Securities | Net investment income |  |  |  |
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Total gains (losses) realized and unrealized, included in earnings |  |  | (2) | (10)
Asset-backed Securities | Net realized investment gains (losses) |  |  |  |
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Total gains (losses) realized and unrealized, included in earnings | 0 | (2) | (11) | (2)
Equity securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 852 |  | 0 |
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Included in other comprehensive income | 18 |  | 16 |
Purchases | 2,500 |  | 9,083 |
Sales | 0 |  | (5,730) |
Transfers in | 69 |  | 69 |
Transfers out | (868) |  | (868) |
Ending balance | 2,569 |  | 2,569 |
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end | (1) |  | (1) |
Equity securities | Net investment income |  |  |  |
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Total gains (losses) realized and unrealized, included in earnings |  |  | 0 |
Equity securities | Net realized investment gains (losses) |  |  |  |
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Total gains (losses) realized and unrealized, included in earnings | (2) |  | (1) |
Other Investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 2,222 | 1,568 | 0 | 3,086
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Included in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 205 | 0
Sales | 0 | 0 | 0 | 0
Transfers in | 0 |  | 2,152 | 0
Transfers out | (1,583) | (1,711) | (1,583) | (3,237)
Ending balance | 0 | 0 | 0 | 0
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end | (639) | 143 | (774) | 151
Other Investments | Net investment income |  |  |  |
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Total gains (losses) realized and unrealized, included in earnings |  |  | 0 | 0
Other Investments | Net realized investment gains (losses) |  |  |  |
Gains Losses By Earnings Category Assets [Abstract] |  |  |  |
Total gains (losses) realized and unrealized, included in earnings | $ (639) | $ 143 | $ (774) | $ 151

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