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Retrocession Arrangements and Reinsurance Ceded Receivables Retrocession Arrangements and Reinsurance Ceded Receivables (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 711,463 | $ 578,206
Reinsurance Recoverables, Percentage of Total | 100.00% | 100.00%
Other Reinsurers [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 153,963 | $ 160,285
Reinsurance Recoverables, Percentage of Total | 21.60% | 27.60%
AM Best, A+ Rating [Member] | Reinsurer A [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 201,915 | $ 210,996
Reinsurance Recoverables, Percentage of Total | 28.40% | 36.50%
AM Best, A+ Rating [Member] | Reinsurer B [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 193,294 | $ 45,541
Reinsurance Recoverables, Percentage of Total | 27.20% | 7.90%
AM Best, A+ Rating [Member] | Reinsurer C [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 73,148 | $ 74,412
Reinsurance Recoverables, Percentage of Total | 10.30% | 12.90%
AM Best, A Rating [Member] | Reinsurer E [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 45,464 | $ 43,818
Reinsurance Recoverables, Percentage of Total | 6.40% | 7.60%
AM Best, A++ Rating [Member] | Reinsurer D [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 43,679 | $ 43,154
Reinsurance Recoverables, Percentage of Total | 6.10% | 7.50%

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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 Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 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.(a),6) -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 03 -Paragraph 6 -Article 7 + Details
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