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Commitments, Contingencies and Other Items (Narrative) (Details) £ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£) | Dec. 31, 2015 USD ($)
Commitments and Contingencies [Line Items] |  |  |
Credit facilities outstanding | $ 487,857,000 | £ 10,000 |
Initial commitments | 1,000,000,000 |  |
Fulfilled commitments | 585,200,000 |  |
Unfunded commitments | $ 429,900,000 |  |
Initial capital lease term | 20 years |  |
Bargain renewal option term | 30 years |  |
Reduction in Taxes | Property |  |  |
Commitments and Contingencies [Line Items] |  |  |
Recovery of previously recognized acquisition expenses |  |  | $ 7,700,000
Letter of Credit |  |  |
Commitments and Contingencies [Line Items] |  |  |
Letters of credit outstanding | $ 501,400,000 |  |
Letter of Credit | Top Layer Reinsurance Ltd. |  |  |
Commitments and Contingencies [Line Items] |  |  |
Collateral pledged to support letter of credit | 37,500,000 |  |
Letter of Credit | Capital Support Agreement | Top Layer Reinsurance Ltd. |  |  |
Commitments and Contingencies [Line Items] |  |  |
Maximum mandatory capital contribution in the event of loss that reduced capital and surplus below specified level | $ 50,000,000 |  |
Investments as a Percentage of Shareholders' Equity |  |  |
Commitments and Contingencies [Line Items] |  |  |
Concentration risk percentage | 10.00% |  |
Renaissance Reinsurance FAL Facility | Line of Credit | Bank Of Montreal, Citibank Europe and ING Bank |  |  |
Commitments and Contingencies [Line Items] |  |  |
Credit facilities outstanding | $ 180,000,000 |  |
Specialty Risks FAL Facility | Line of Credit | Bank Of Montreal, Citibank Europe and ING Bank |  |  |
Commitments and Contingencies [Line Items] |  |  |
Credit facilities outstanding | £ |  | £ 10,000 |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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