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Variable Interest Entities (Details) (USD $)
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3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | |||
|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
Upsilon Re [Member]
Variable Interest Entity, Primary Beneficiary [Member]
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Jun. 30, 2012
Tim Re III [Member]
Variable Interest Entity, Primary Beneficiary [Member]
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Jun. 30, 2012
Nonvoting Class B Shares [Member]
Upsilon Re [Member]
Variable Interest Entity, Primary Beneficiary [Member]
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Jun. 30, 2012
Nonvoting Class B Shares [Member]
Tim Re III [Member]
Variable Interest Entity, Primary Beneficiary [Member]
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| Variable Interest Entity [Line Items] | ||||||||
| Gross premiums written | $ 667,336,000 | $ 641,563,000 | $ 1,331,487,000 | $ 1,252,068,000 | $ 37,400,000 | $ 41,100,000 | ||
| Ceded premiums written | 239,706,000 | 213,568,000 | 411,282,000 | 371,498,000 | 37,700,000 | |||
| Issuance of equity to third party investors | 16,800,000 | 44,800,000 | ||||||
| Additional contribution | 10,300,000 | |||||||
| Variable interest entity, ownership percentage | 74.50% | 18.60% | ||||||
| Investment in variable interest entity | 48,800,000 | |||||||
| Risk participation percentage | 61.40% | |||||||
| Capital provided in connection with third party reinsurance participation | $ 17,600,000 | $ 5,200,000 | ||||||