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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items] |  |  |
Current year | $ 1,390,767 | $ 1,902,424 | $ 694,957
Prior years | (270,749) | (40,996) | (164,126)
Consolidated Subsidiaries |  |  |
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items] |  |  |
Deferred Policy Acquisition Costs | 476,661 | 426,551 | 335,325
Reserves for Unpaid Claims and Claim Adjustment Expenses | 6,076,271 | 5,080,408 | 2,848,294
Discount, if any, Deducted | 0 | 0 | 0
Unearned Premiums | 1,716,021 | 1,477,609 | 1,231,573
Earned Premiums | 1,976,129 | 1,717,575 | 1,403,430
Net Investment Income | 261,866 | 222,209 | 181,726
Current year | 1,390,767 | 1,902,424 | 694,957
Prior years | (270,749) | (40,996) | (164,126)
Amortization of Deferred Policy Acquisition Costs | 432,989 | 346,892 | 289,323
Paid Claims and Claim Adjustment Expenses | 894,769 | 974,825 | 589,294
Net Premiums Written | $ 2,131,902 | $ 1,871,325 | $ 1,535,312

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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=99382578&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=34713774&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=34713774&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=34713774&loc=d3e575016-122915 + Details
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