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Schedule VI - Supplemental Information Concerning Consolidated Property and Casualty Insurance Operations Schedule VI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract] |  |  |
Reserves for Unpaid Losses and LAE | $ 1,089,966 | $ 760,357 | $ 661,203
Incurred Losses and LAE Current Year | 615,102 | 466,359 | 404,271
Incurred Losses and LAE Prior Years | (6,786) | 33,134 | 4,318
Paid Losses and LAE | 471,138 | 404,784 | 401,815
Net Investment Income | 24,125 | 30,145 | 26,170
Deferred Policy Acquisition Costs (DPAC) | 74,414 | 104,572 | 105,582
Amortization of DPAC | 287,216 | 278,161 | 225,900
Net Premiums Written | 700,992 | 746,993 | 740,131
Net Premiums Earned | 765,663 | 752,400 | 689,276
Unearned Premiums | $ 723,938 | $ 674,055 | $ 627,313

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- Definition Amount, after effect of reinsurance, of expense for claim incurred in current reporting period and related claim settlement cost for property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column H)(1)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount, after effect of reinsurance, of expense (reversal of expense) for claim incurred in prior reporting period and related claim settlement cost for property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column H)(2)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount of amortization expense on deferred policy acquisition cost for property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column I)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount of deferred policy acquisition cost related to property-casualty insurance policy written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column B)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount of premium revenue earned by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column F)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount of net investment income earned by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column G)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount of loss reported and paid for claim and claim adjustment expense by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column J)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount of premium written by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column K)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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