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Taxation (Income Tax Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Expected income tax benefit (expense)									$ 25,489	$ (22,874)	$ 17,697
Nondeductible expenses									5,074	(7,059)	(370)
Income tax audit adjustment									3,424	0	0
Effect of change in tax rate									3,055	(262)	(708)
Tax exempt income									218	400	944
Transfer pricing									206	2,503	(2,481)
GAAP to statutory accounting difference									0	6,553	0
Non-taxable foreign exchange (losses) gains									(7)	(4)	586
U.S. base erosion and anti-abuse tax									(36)	0	(1,271)
Withholding tax									(1,822)	(665)	(1,831)
Non-taxable loss on sale of RenaissanceRe UK									(6,091)	0	0
Change in valuation allowance									(13,003)	(5,481)	(5,255)
Foreign branch adjustments									(17,821)	7,315	0
Other									(1,548)	2,359	(1,009)
Income tax (expense) benefit	$ 9,923	$ 8,244	$ (29,875)	$ 8,846	$ 3,455	$ (3,664)	$ (9,475)	$ (7,531)	$ (2,862)	$ (17,215)	$ 6,302

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