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Other Comprehensive Income - Components of accumulated other comprehensive income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 212,091	$ (178,720)	$ 118,044
Other comprehensive income (loss) before reclassifications	702,991	509,752	(291,543)
Amounts reclassified from accumulated other comprehensive income	(426,187)	(118,941)	144,573
Net current period other comprehensive income (loss)	276,804	390,811	(146,970)
Ending balance	488,895	212,091	(178,720)
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(149,794)
Unrealized Appreciation on Available-For-Sale Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	258,486	(114,178)	157,400
Other comprehensive income (loss) before reclassifications	668,996	491,605	(266,357)
Amounts reclassified from accumulated other comprehensive income	(426,187)	(118,941)	144,573
Net current period other comprehensive income (loss)	242,809	372,664	(121,784)
Ending balance	501,295	258,486	(114,178)
Unrealized Appreciation on Available-For-Sale Investments | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(149,794)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(46,395)	(64,542)	(39,356)
Other comprehensive income (loss) before reclassifications	33,995	18,147	(25,186)
Amounts reclassified from accumulated other comprehensive income	0	0	0
Net current period other comprehensive income (loss)	33,995	18,147	(25,186)
Ending balance	$ (12,400)	$ (46,395)	(64,542)
Foreign Currency Translation Adjustments | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 0

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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.

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