Debt and Credit Facilities (Summary of Debt Obligations) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt, fair value	$ 964,800	$ 973,342
Long-term debt	948,663	960,495
RenaissanceRe Finance, Inc. | 3.700% Senior Notes Due April 1, 2025
Debt Instrument [Line Items]
Long-term debt, fair value	291,750	287,100
Long-term debt	296,948	296,577
RenRe North America Holdings Inc | 5.75% Senior Notes Due March 15, 2020
Debt Instrument [Line Items]
Long-term debt, fair value	270,875	270,000
Long-term debt	248,941	248,610
Platinum Underwriters Finance, Inc | Series B 7.50% Notes Due June 1, 2017
Debt Instrument [Line Items]
Long-term debt, fair value	257,500	267,500
Long-term debt	255,352	268,196
DaVinciRe Holdings Ltd. | 4.750% Senior Notes Due May 1, 2025
Debt Instrument [Line Items]
Long-term debt, fair value	144,675	148,742
Long-term debt	$ 147,422	$ 147,112