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Investment Information - Allowance for expected credit losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Allowance for expected credit losses |  |  |  |  |  |  |
Balance at beginning of period |  |  |  |  | $ 2,397 |  |
Balance at end of period |  | $ 2,111 |  |  | $ 2,111 |  |
Accounting Standards Update |  |  |  |  | Accounting Standards Update 2016-13 [Member] |  |
Available for sale |  |  |  |  |  |  |
Allowance for expected credit losses |  |  |  |  |  |  |
Balance at beginning of period |  | 2,124 |  | $ 5,869 | $ 2,397 |  | $ 0
Cumulative effect of accounting change | [1] |  |  |  |  |  | 634
Additions for current-period provision for expected credit losses |  | 48 |  | 229 | 2,710 |  | 10,578
Additions (reductions) for previously recognized expected credit losses |  | 405 |  | (1,560) | (1,317) |  | (5,815)
Reductions due to disposals (3) |  | (466) | [2] | (605) | (1,679) | [2] | (1,464)
Balance at end of period |  | 2,111 |  | 3,933 | 2,111 |  | 3,933
Available for sale | Structured securities |  |  |  |  |  |  |
Allowance for expected credit losses |  |  |  |  |  |  |
Balance at beginning of period | [3] | 759 |  | 1,726 | 1,490 |  | 0
Cumulative effect of accounting change | [1],[3] |  |  |  |  |  | 517
Additions for current-period provision for expected credit losses | [3] | 48 |  | 27 | 282 |  | 2,868
Additions (reductions) for previously recognized expected credit losses | [3] | 14 |  | 403 | (751) |  | (903)
Reductions due to disposals (3) | [3] | (234) | [2] | (28) | (434) | [2] | (354)
Balance at end of period |  | 587 |  | 2,128 | 587 |  | 2,128
Available for sale | Municipal bonds |  |  |  |  |  |  |
Allowance for expected credit losses |  |  |  |  |  |  |
Balance at beginning of period |  | 6 |  | 28 | 11 |  | 0
Cumulative effect of accounting change | [1] |  |  |  |  |  | 0
Additions for current-period provision for expected credit losses |  | 0 |  | 0 | 0 |  | 67
Additions (reductions) for previously recognized expected credit losses |  | (4) |  | 33 | (9) |  | 8
Reductions due to disposals (3) |  | 0 | [2] | 0 | 0 | [2] | (14)
Balance at end of period |  | 2 |  | 61 | 2 |  | 61
Available for sale | Corporate bonds |  |  |  |  |  |  |
Allowance for expected credit losses |  |  |  |  |  |  |
Balance at beginning of period |  | 1,359 |  | 4,115 | 896 |  | 0
Cumulative effect of accounting change | [1] |  |  |  |  |  | 117
Additions for current-period provision for expected credit losses |  | 0 |  | 202 | 2,428 |  | 7,643
Additions (reductions) for previously recognized expected credit losses |  | 395 |  | (1,996) | (557) |  | (4,920)
Reductions due to disposals (3) |  | (232) | [2] | (577) | (1,245) | [2] | (1,096)
Balance at end of period |  | $ 1,522 |  | $ 1,744 | $ 1,522 |  | $ 1,744
[1] | Adoption of ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326)”
[2] | Reduction for the 2021 periods primarily related to the Company’s deconsolidation of Watford.
[3] | Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.

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