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Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 769,324 | $ 782,027
Reinsurance Recoverables, Percentage of Total | 100.00% | 100.00%
Other Reinsurers [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 117,942 | $ 127,808
Reinsurance Recoverables, Percentage of Total | 15.30% | 16.20%
AM Best, A+ Rating [Member] | Reinsurer A [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 303,942 | $ 301,478
Reinsurance Recoverables, Percentage of Total | 39.50% | 38.60%
AM Best, A+ Rating [Member] | Reinsurer B [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 203,702 | $ 203,898
Reinsurance Recoverables, Percentage of Total | 26.50% | 26.10%
AM Best, A+ Rating [Member] | Reinsurer D [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 41,049 | $ 40,528
Reinsurance Recoverables, Percentage of Total | 5.30% | 5.20%
AM Best, A Rating [Member] | Reinsurer C [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 67,599 | $ 67,723
Reinsurance Recoverables, Percentage of Total | 8.80% | 8.70%
AM Best, A++ Rating [Member] | Reinsurer E [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 35,090 | $ 40,592
Reinsurance Recoverables, Percentage of Total | 4.60% | 5.20%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts 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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 + Details
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