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Other Comprehensive Income - Components of accumulated other comprehensive income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | $ (64,600) | $ 488,895 | $ 212,091
Other comprehensive income (loss) before reclassifications | (1,829,369) | (437,427) | 702,991
Amounts reclassified from accumulated other comprehensive income | 247,799 | (116,068) | (426,187)
Net current period other comprehensive income (loss) | (1,581,570) | (553,495) | 276,804
Ending balance | (1,646,170) | (64,600) | 488,895
Unrealized Appreciation on Available-For-Sale Investments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | 13,486 | 501,295 | 258,486
Other comprehensive income (loss) before reclassifications | (1,772,649) | (371,741) | 668,996
Amounts reclassified from accumulated other comprehensive income | 247,799 | (116,068) | (426,187)
Net current period other comprehensive income (loss) | (1,524,850) | (487,809) | 242,809
Ending balance | (1,511,364) | 13,486 | 501,295
Foreign Currency Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (78,086) | (12,400) | (46,395)
Other comprehensive income (loss) before reclassifications | (56,720) | (65,686) | 33,995
Amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0
Net current period other comprehensive income (loss) | (56,720) | (65,686) | 33,995
Ending balance | $ (134,806) | $ (78,086) | $ (12,400)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e681-108580 + Details
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