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Debt and Credit Facilities (Credit Facilities) (Details) - Jun. 30, 2015 £ in Thousands, $ in Thousands	USD ($)	GBP (£)
Debt Instrument [Line Items]
Long-term line of credit	$ 613,249	£ 70,000
Syndicate 1458 | Letter of Credit | Citibank Europe PLC
Debt Instrument [Line Items]
Letters of credit outstanding	300,000
Long-term line of credit | £		£ 70,000
RenaissanceRe Specialty Risks Ltd. | Letter of Credit | Citibank Europe PLC
Debt Instrument [Line Items]
Letters of credit outstanding	9,129
Standby Letter of Credit Facility | Wells Fargo
Debt Instrument [Line Items]
Letters of credit outstanding	160,342
Standby Letter of Credit Facility | National Australia Bank Limited
Debt Instrument [Line Items]
Letters of credit outstanding	0
Bilateral Facility | Bilateral Facility Participants | Letter of Credit | Citibank Europe PLC
Debt Instrument [Line Items]
Letters of credit outstanding	143,778
Revolving Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding	$ 0

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- 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 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 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 SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 19, 20, 22



-Article 5

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