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Schedule VI - Supplementary Information For Property and Casualty Insurance Underwriters (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 [Line Items] |  |  |
Net Losses and Loss Adjustment Expenses Incurred Related to Current Year | $ 4,851,051 | $ 3,297,037 | $ 3,162,818
Net Losses and Loss Adjustment Expenses Incurred Related to Prior Years | (161,452) | (163,585) | (272,712)
Consolidated Subsidiaries |  |  |
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items] |  |  |
Deferred Acquisition Costs | 790,708 | 633,400 | 569,574
Reserves for Losses and Loss Adjustment Expenses | 16,513,929 | 13,891,842 | 11,853,297
Discount, if any, deducted in Column C | 23,326 | 22,012 | 21,145
Unearned Premiums | 4,838,965 | 4,339,549 | 3,753,636
Net Premiums Earned | 6,991,935 | 5,786,498 | 5,231,975
Net investment income | 519,608 | 627,738 | 563,633
Net Losses and Loss Adjustment Expenses Incurred Related to Current Year | 4,851,051 | 3,297,037 | 3,162,818
Net Losses and Loss Adjustment Expenses Incurred Related to Prior Years | (161,452) | (163,585) | (272,712)
Amortization of Deferred Acquisition Costs | 1,004,842 | 840,945 | 805,135
Net Paid Losses and Loss Adjustment Expenses | 2,661,117 | 2,383,255 | 2,206,164
Net Premiums Written | $ 7,437,716 | $ 6,039,067 | $ 5,346,747

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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, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + 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 discount deducted from reserve for unpaid 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 D)) -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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