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Debt and Credit Facilities (Summary of Debt Obligations) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Fair Value	$ 980,300	$ 1,018,200
Carrying Value	$ 990,749	989,623
3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Debt instrument, Interest rate	3.45%
3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Debt instrument, Interest rate	3.70%
5.750% Senior Notes due 2020
Debt Instrument [Line Items]
Debt instrument, Interest rate	5.75%
4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Debt instrument, Interest rate	4.75%
Senior Notes
Debt Instrument [Line Items]
Fair Value	$ 980,318	1,018,235
Carrying Value	990,749	989,623
Senior Notes | 3.450% Senior Notes due 2027 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Fair Value	282,585	294,654
Carrying Value	295,673	295,303
Senior Notes | 3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Fair Value	293,559	302,781
Carrying Value	297,594	297,318
Senior Notes | 5.750% Senior Notes due 2020
Debt Instrument [Line Items]
Fair Value	256,250	263,750
Carrying Value	249,520	249,272
Senior Notes | 4.750% Senior Notes due 2025 (DaVinciRe) | DaVinciRe Holdings Ltd.
Debt Instrument [Line Items]
Fair Value	147,924	157,050
Carrying Value	$ 147,962	$ 147,730

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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