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Reinsurance (Cumulative Incurred Claims) (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 137,800,000 |  |  |  |
Claims Reserve | $ 1,800,000 |  |  |  |
Cumulative Number Of Reported Claims | 124,370 |  |  |  |
Incident Year 2015 [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 33,400,000 | $ 33,400,000 | $ 33,400,000 | $ 33,400,000 | $ 33,100,000
Claims Reserve | $ 0 |  |  |  |
Cumulative Number Of Reported Claims | 32,909 |  |  |  |
Incident Year 2016 [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 26,000,000.0 | 26,000,000.0 | 26,000,000.0 | $ 25,700,000 |
Claims Reserve | $ 0 |  |  |  |
Cumulative Number Of Reported Claims | 25,215 |  |  |  |
Incident Year 2017 [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 22,600,000 | 22,500,000 | $ 22,300,000 |  |
Claims Reserve | $ 0 |  |  |  |
Cumulative Number Of Reported Claims | 20,461 |  |  |  |
Incident Year 2018 [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 25,700,000 | $ 25,800,000 |  |  |
Claims Reserve | $ 0 |  |  |  |
Cumulative Number Of Reported Claims | 22,305 |  |  |  |
Incident Year 2019 [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 30,100,000 |  |  |  |
Claims Reserve | $ 1,800,000 |  |  |  |
Cumulative Number Of Reported Claims | 23,480 |  |  |  |

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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -URI http://asc.fasb.org/extlink&oid=27015833&loc=d3e570705-122907 + Details
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