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Investment Information - Allowance for expected credit losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Allowance for expected credit losses |  |  |  |  |
Balance at beginning of period |  | $ 5,869 |  | $ 0 |
Cumulative effect of accounting change |  | 0 |  | 634 |
Additions for current-period provision for expected credit losses |  | 229 |  | 10,578 |
Additions (reductions) for previously recognized expected credit losses |  | (1,560) |  | (5,815) |
Reductions due to disposals |  | (605) |  | (1,464) |
Write-offs charged against the allowance |  | 0 |  | 0 |
Balance at end of period |  | 3,933 |  | 3,933 |
Fixed maturities |  |  |  |  |
Allowance for expected credit losses |  |  |  |  |
Additions for current-period provision for expected credit losses |  | (1,332) | $ 0 | 4,763 | $ 0
Balance at end of period |  | 3,933 |  | 3,933 |
Fixed maturities | Structured securities |  |  |  |  |
Allowance for expected credit losses |  |  |  |  |
Balance at beginning of period |  | 1,726 |  | 0 |
Cumulative effect of accounting change |  | 0 |  | 517 |
Additions for current-period provision for expected credit losses |  | 27 |  | 2,868 |
Additions (reductions) for previously recognized expected credit losses |  | 403 |  | (903) |
Reductions due to disposals |  | (28) |  | (354) |
Write-offs charged against the allowance |  | 0 |  | 0 |
Balance at end of period |  | 2,128 |  | 2,128 |
Fixed maturities | Municipal bonds |  |  |  |  |
Allowance for expected credit losses |  |  |  |  |
Balance at beginning of period |  | 28 |  | 0 |
Cumulative effect of accounting change |  | 0 |  | 0 |
Additions for current-period provision for expected credit losses |  | 0 |  | 67 |
Additions (reductions) for previously recognized expected credit losses |  | 33 |  | 8 |
Reductions due to disposals |  | 0 |  | (14) |
Write-offs charged against the allowance |  | 0 |  | 0 |
Balance at end of period |  | 61 |  | 61 |
Fixed maturities | Corporate bonds |  |  |  |  |
Allowance for expected credit losses |  |  |  |  |
Balance at beginning of period |  | 4,115 |  | 0 |
Cumulative effect of accounting change |  | 0 |  | 117 |
Additions for current-period provision for expected credit losses |  | 202 |  | 7,643 |
Additions (reductions) for previously recognized expected credit losses |  | (1,996) |  | (4,920) |
Reductions due to disposals |  | (577) |  | (1,096) |
Write-offs charged against the allowance |  | 0 |  | 0 |
Balance at end of period |  | 1,744 |  | 1,744 |
Short-term investments |  |  |  |  |
Allowance for expected credit losses |  |  |  |  |
Balance at beginning of period |  | 0 |  | 0 |
Cumulative effect of accounting change |  | 0 |  | 0 |
Additions for current-period provision for expected credit losses |  | 0 |  | 0 |
Additions (reductions) for previously recognized expected credit losses |  | 0 |  | 0 |
Reductions due to disposals |  | 0 |  | 0 |
Write-offs charged against the allowance |  | 0 |  | 0 |
Balance at end of period | [1] | $ 0 |  | $ 0 |
[1] | Effective January 1, 2020, the Company adopted ASU 2016-13 and as a result any credit impairment losses on the Company’s available-for-sale investments are recorded as an allowance, subject to reversal.

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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- Definition Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
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- Definition Amount of expense (reversal of expense) for allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
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- Definition Amount of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
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- Definition Amount of writeoff of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from change in present value of expected cash flows. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82922868-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922897-210455 + Details
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