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Income Taxes - Income before taxes by jurisdiction (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Income (loss) before income taxes	$ 1,577,549	$ 1,849,110	$ 841,772
Bermuda
Income Tax Disclosure [Line Items]
Income (loss) before income taxes	1,114,117	1,122,952	388,492
United States
Income Tax Disclosure [Line Items]
Income (loss) before income taxes	409,893	701,480	440,823
Other
Income Tax Disclosure [Line Items]
Income (loss) before income taxes	$ 53,539	$ 24,678	$ 12,457

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[Line Items] for Income Tax Disclosure [Table]

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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