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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

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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