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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of earned premiums ceded to other entities.

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Amount of written premiums ceded to other entities.

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- Definition

Represents a sale (new stock issuance) by a subsidiary to noncontrolling interests (third parties, parties directly or indirectly unrelated to parent) during the period. The capital transaction by subsidiary does not result in a loss of control by the parent, but does effect a change in total (consolidated) equity attributable to the parent.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

+ References

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Cash outflow to owners or shareholders, excluding ordinary dividends. Includes special dividends.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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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.

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No definition available.

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Variable Interest Entities (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Jan. 01, 2017	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Variable Interest Entity [Line Items]
Contributions to subsidiaries		$ 0	$ 0
Assets		13,319,627		$ 12,352,082
Liabilities		7,270,799		6,309,911
Ceded premiums written		377,954	350,458
Ceded premiums earned		191,122	136,175
Upsilon RFO Re Ltd. \| Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Return of capital		41,800		242,500
Assets		399,600		193,000
Liabilities		399,600		193,000
Upsilon RFO Re Ltd. \| Variable Interest Entity, Primary Beneficiary \| Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Issuance of equity to third party investors		134,100		166,600
Contributions to subsidiaries		9,500		55,200
Upsilon RFO Re Ltd. \| Variable Interest Entity, Primary Beneficiary \| RenaissanceRe Holdings Ltd.
Variable Interest Entity [Line Items]
Return of capital		$ 9,500		$ 59,800
Variable interest entity, ownership percentage		16.60%		28.80%
Upsilon RFO Re Ltd. \| Variable Interest Entity, Primary Beneficiary \| Third party investor \| Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Contributions to subsidiaries		$ 7,500
Mona Lisa Re Ltd \| Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets		181,300		$ 184,200
Liabilities		181,300		$ 184,200
Mona Lisa Re Ltd \| Variable Interest Entity, Not Primary Beneficiary \| Renaissance Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written		100	100
Ceded premiums earned		1,800	1,900
Mona Lisa Re Ltd \| Variable Interest Entity, Not Primary Beneficiary \| DaVinci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written		37	100
Ceded premiums earned		1,300	$ 1,300
Renaissance Reinsurance Ltd. \| Variable Interest Entity, Primary Beneficiary \| Fibonacci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written		7,400
Ceded premiums earned		1,800
Fibonacci Reinsurance Ltd. \| Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Issuance of equity to third party investors	$ 140,000
Other Investments \| Fibonacci Reinsurance Ltd. \| Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Investment in participating notes		$ 30,000