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Reinsurance (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Ceded Credit Risk [Line Items] |  |  |
Reinsurance recoverable | $ 1,204,059 | $ 1,588,304 | $ 1,586,630
Allowance for reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Valuation allowances and reserves balance | $ 6,300 |  | $ 7,000
Customer Concentration Risk, Customer One | Reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 12.20% | 10.40% |
Customer Concentration Risk, Customer One | Allowance for reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 19.90% | 11.10% |
Customer Concentration Risk, Customer Two | Reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 12.00% | 7.50% |
Customer Concentration Risk, Customer Two | Allowance for reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 19.80% | 9.20% |
Customer Concentration Risk, Customer Three | Reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 9.20% | 7.30% |
Customer Concentration Risk, Customer Three | Allowance for reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 18.00% | 8.40% |
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 52.50% | 54.50% |
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, A- Rating |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 46.40% | 44.50% |
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, BBB Rating |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 1.10% | 1.00% |

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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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