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Reinsurance and Policy Benefits and Losses, Claims, and Loss Expenses Payable (Incurred Claims Development) (Details) $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($)
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Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 12,594 |  |  |  |  |  |
Accident Year 2012 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | 8,735 | $ 8,735 | $ 8,753 | $ 8,788 | $ 8,831 | $ 8,903 | $ 8,971
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net |  |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 6,889 |  |  |  |  |  |
Accident Year 2013 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 9,595 | 9,576 | 9,741 | 9,914 | 9,853 | $ 9,861 |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net |  |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 7,663 |  |  |  |  |  |
Accident Year 2014 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 10,748 | 10,759 | 10,720 | 10,907 | $ 11,691 |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 323 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 9,648 |  |  |  |  |  |
Accident Year 2015 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 12,464 | 12,460 | 12,459 | $ 12,214 |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 1,821 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 10,719 |  |  |  |  |  |
Accident Year 2016 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 13,056 | 13,011 | $ 13,297 |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 1,300 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 11,146 |  |  |  |  |  |
Accident Year 2017 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 16,109 | $ 15,749 |  |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 1,218 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 11,496 |  |  |  |  |  |
Accident Year 2018 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 19,580 |  |  |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 7,932 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 11,144 |  |  |  |  |  |

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- Definition Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671321-158438 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671317-158438 + Details
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