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Debt and Credit Facilities (Summary of Debt Obligations) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 29, 2017 | Jun. 01, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long-term debt, Fair value | $ 1,034,200 |  |  | $ 964,800
Debt | $ 989,245 |  |  | $ 948,663
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% |  |  |
5.75% Senior Notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, Interest rate | 5.75% |  |  |
Series B 7.50% Senior Notes due 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, Interest rate |  |  |  | 7.50%
4.750% Senior Notes due 2025 (DaVinciRe) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, Interest rate | 4.75% |  |  |
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, Fair value | $ 1,034,244 |  |  | $ 964,800
Debt | 989,245 |  |  | 948,663
Senior Notes | 3.700% Senior Notes due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, Fair value | 309,648 |  |  | 291,750
Debt | 297,225 |  |  | 296,948
Senior Notes | 5.75% Senior Notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, Fair value | 269,265 |  |  | 270,875
Debt | 249,188 |  |  | 248,941
Senior Notes | RenaissanceRe Finance, Inc. | 3.450% Senior Notes due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, Fair value | 296,589 |  |  | 0
Debt | 295,179 |  |  | 0
Debt instrument, Interest rate |  | 3.45% |  |
Senior Notes | Platinum Underwriters Finance, Inc | Series B 7.50% Senior Notes due 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, Fair value | 0 |  |  | 257,500
Debt | 0 |  |  | 255,352
Debt instrument, Interest rate |  |  | 7.50% |
Senior Notes | DaVinciRe Holdings Ltd. | 4.750% Senior Notes due 2025 (DaVinciRe) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, Fair value | 158,742 |  |  | 144,675
Debt | $ 147,653 |  |  | $ 147,422

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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