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Reinsurance (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Allowance for Reinsurance Recoverable |  |
Valuation allowance recorded against reinsurance recoverable | $ 4.2 | $ 1.6
Reinsurance Recoverable | Largest reinsurance recoverable, Customer One |  |
Concentration risk percentage | 27.10% | 21.50%
Reinsurance Recoverable | Largest reinsurance recoverable, Customer Two |  |
Concentration risk percentage | 19.90% | 13.80%
Reinsurance Recoverable | Largest reinsurance recoverable, Customer Three |  |
Concentration risk percentage | 7.70% | 13.10%
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer One |  |
Concentration risk percentage | 27.10% | 22.70%
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer Two |  |
Concentration risk percentage | 17.90% | 8.30%
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer Three |  |
Concentration risk percentage | 5.60% | 3.20%

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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