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Schedule VI. Supplementary Insurance Information Concerning Property-Casualty Insurance Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items] |  |  |
Current year | $ 2,123,876 | $ 1,390,767 | $ 1,902,424
Prior years | (26,855) | (270,749) | (40,996)
Consolidated Subsidiaries |  |  |
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items] |  |  |
Deferred Policy Acquisition Costs | 663,991 | 476,661 | 426,551
Reserves for Unpaid Claims and Claim Adjustment Expenses | 9,384,349 | 6,076,271 | 5,080,408
Discount, if any, Deducted | 0 | 0 | 0
Unearned Premiums | 2,530,975 | 1,716,021 | 1,477,609
Earned Premiums | 3,338,403 | 1,976,129 | 1,717,575
Net Investment Income | 423,833 | 261,866 | 222,209
Current year | 2,123,876 | 1,390,767 | 1,902,424
Prior years |  | (270,749) | (40,996)
Amortization of Deferred Policy Acquisition Costs | 762,232 | 432,989 | 346,892
Paid Claims and Claim Adjustment Expenses | 1,098,054 | 894,769 | 974,825
Net Premiums Written | $ 3,381,493 | $ 2,131,902 | $ 1,871,325

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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 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=34713774&loc=d3e575016-122915 + Details
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