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Reinsurance and Policy Benefits and Losses, Claims, and Loss Expenses Payable (Incurred Claims Development) (Details) - Property and Casualty Insurance [Member] $ in Thousands | 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 | $ 5,705 |  |  |  |
Accident Year 2012 [Member] |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | 8,753 | $ 8,788 | $ 8,831 | $ 8,903 | $ 8,971
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 2 |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 6,888 |  |  |  |
Accident Year 2013 [Member] |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 9,741 | 9,914 | 9,853 | $ 9,861 |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 100 |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 7,640 |  |  |  |
Accident Year 2014 [Member] |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 10,720 | 10,907 | $ 11,691 |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 338 |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 9,696 |  |  |  |
Accident Year 2015 [Member] |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 12,459 | $ 12,214 |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 1,779 |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 10,700 |  |  |  |
Accident Year 2016 [Member] |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 13,297 |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 3,486 |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 10,932 |  |  |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671317-158438 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671321-158438 + Details
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- Definition Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671311-158438 + Details
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