$MCY
MERCURY GENERAL CORP Stock $mcy

$mcy Overview Financials Valuation SEC Filings Company Website

2022 Q4 Form 10-Q Financial Statement

#000006499622000023 Filed on November 01, 2022

Income Statement

Concept	2022 Q4	2022 Q3
Revenue	$1.152B	$900.3M
YoY Change	9.76%	-3.42%
Cost Of Revenue		$2.500M
YoY Change		-16.67%
Gross Profit		$897.8M
YoY Change		-3.38%
Gross Profit Margin		99.72%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$30.99M	$168.9M
YoY Change	13.92%	10.32%
% of Gross Profit		18.81%
Operating Expenses	$1.165B	$1.025B
YoY Change	15.29%	10.05%
Operating Profit		-$127.1M
YoY Change		5913.72%
Interest Expense	-$4.410M	$4.300M
YoY Change	3.33%	0.0%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	-$17.34M	-$128.9M
YoY Change	-149.74%	3691.18%
Income Tax	-$10.57M	-$30.60M
% Of Pretax Income
Net Earnings	-$6.770M	-$98.30M
YoY Change	-122.22%	-7661.54%
Net Earnings / Revenue	-0.59%	-10.92%
Basic Earnings Per Share		-$1.78
Diluted Earnings Per Share	-$0.12	-$1.78
COMMON SHARES
Basic Shares Outstanding	55.37M shares	55.37M shares
Diluted Shares Outstanding		55.37M shares

Balance Sheet

Concept	2022 Q4	2022 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$289.8M	$335.9M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$11.36M	$7.871M
YoY Change	49.45%	8.45%
LONG-TERM ASSETS
Property, Plant & Equipment	$171.4M	$189.8M
YoY Change	-10.4%	2.05%
Goodwill	$42.80M	$42.80M
YoY Change	0.0%	0.0%
Intangibles	$9.212M	$9.455M
YoY Change	-10.17%	-10.14%
Long-Term Investments	$4.911B	$4.683B
YoY Change	-4.51%	-7.72%
Other Assets	$42.90M	$65.71M
YoY Change		530.57%
Total Long-Term Assets	$6.503B	$6.447B
YoY Change	-3.87%	-4.45%
TOTAL ASSETS
Total Short-Term Assets	$11.36M	$7.871M
Total Long-Term Assets	$6.503B	$6.447B
Total Assets	$6.514B	$6.455B
YoY Change	-3.81%	-4.44%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$151.7M	$155.4M
YoY Change	-10.31%	-14.66%
Accrued Expenses	$21.92M	$26.37M
YoY Change	-36.59%	-28.44%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$173.6M	$181.8M
YoY Change	-14.77%	-16.98%
LONG-TERM LIABILITIES
Long-Term Debt	$398.3M	$373.2M
YoY Change	6.81%	0.11%
Other Long-Term Liabilities	$289.6M	$285.0M
YoY Change	13.22%	-1.97%
Total Long-Term Liabilities	$687.9M	$658.2M
YoY Change	9.42%	-0.8%
TOTAL LIABILITIES
Total Short-Term Liabilities	$173.6M	$181.8M
Total Long-Term Liabilities	$687.9M	$658.2M
Total Liabilities	$4.992B	$4.908B
YoY Change	7.77%	6.48%
SHAREHOLDERS EQUITY
Retained Earnings	$1.423B	$1.448B
YoY Change	-30.28%	-29.25%
Common Stock	$98.95M	$98.95M
YoY Change	0.0%	0.04%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.522B	$1.546B
YoY Change
Total Liabilities & Shareholders Equity	$6.514B	$6.455B
YoY Change	-3.81%	-4.44%

Cashflow Statement

Concept	2022 Q4	2022 Q3
OPERATING ACTIVITIES
Net Income	-$6.770M	-$98.30M
YoY Change	-122.22%	-7661.54%
Depreciation, Depletion And Amortization	$30.99M	$168.9M
YoY Change	13.92%	10.32%
Cash From Operating Activities	$67.72M	$89.96M
YoY Change	-7.94%	-18.8%
INVESTING ACTIVITIES
Capital Expenditures	$9.919M	-$8.517M
YoY Change	-183.05%	-27.18%
Acquisitions
YoY Change
Other Investing Activities	-$111.0M	-$17.77M
YoY Change	242.08%	-82.35%
Cash From Investing Activities	-$120.9M	-$26.29M
YoY Change	172.38%	-76.61%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	7.063M	-17.79M
YoY Change	-120.05%	-49.74%
NET CHANGE
Cash From Operating Activities	67.72M	89.96M
Cash From Investing Activities	-120.9M	-26.29M
Cash From Financing Activities	7.063M	-17.79M
Net Change In Cash	-46.11M	45.88M
YoY Change	662.27%	-223.98%
FREE CASH FLOW
Cash From Operating Activities	$67.72M	$89.96M
Capital Expenditures	$9.919M	-$8.517M
Free Cash Flow	$57.80M	$98.48M
YoY Change	-32.4%	-19.6%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2022
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Entity Central Index Key EntityCentralIndexKey	0000064996
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	us-gaap	Derivative Gain Loss Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2022#RealizedInvestmentGainsLosses
CY2021Q3	us-gaap	Derivative Gain Loss Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2022#RealizedInvestmentGainsLosses
CY2022Q3	us-gaap	Derivative Gain Loss Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2022#RealizedInvestmentGainsLosses
	us-gaap	Derivative Gain Loss Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2022#RealizedInvestmentGainsLosses
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2022-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-12257
	dei	Entity Registrant Name EntityRegistrantName	MERCURY GENERAL CORPORATION
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	CA
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	95-2211612
	dei	Entity Address Address Line1 EntityAddressAddressLine1	4484 Wilshire Boulevard
	dei	Entity Address City Or Town EntityAddressCityOrTown	Los Angeles,
	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	90010
	dei	City Area Code CityAreaCode	323
	dei	Local Phone Number LocalPhoneNumber	937-1060
	dei	Security12b Title Security12bTitle	Common Stock
	dei	Trading Symbol TradingSymbol	MCY
	dei	Security Exchange Name SecurityExchangeName	NYSE
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2022Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	55371127	shares
CY2022Q3	mcy	Amortized Cost On Fixed Maturity Trading Investments AmortizedCostOnFixedMaturityTradingInvestments	4105574000	usd
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	468600000	usd
CY2021Q4	mcy	Amortized Cost On Fixed Maturity Trading Investments AmortizedCostOnFixedMaturityTradingInvestments	3909780000	usd
CY2022Q3	us-gaap	Trading Securities Debt TradingSecuritiesDebt	3897859000	usd
CY2021Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	4031523000	usd
CY2022Q3	mcy	Cost Equity Security Trading Investments CostEquitySecurityTradingInvestments	688401000	usd
CY2021Q4	mcy	Cost Equity Security Trading Investments CostEquitySecurityTradingInvestments	754536000	usd
CY2022Q3	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	684335000	usd
CY2021Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	970939000	usd
CY2022Q3	mcy	Cost Short Term Investments CostShortTermInvestments	101548000	usd
CY2021Q4	mcy	Cost Short Term Investments CostShortTermInvestments	141206000	usd
CY2022Q3	us-gaap	Other Short Term Investments OtherShortTermInvestments	100621000	usd
CY2021Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	140127000	usd
CY2022Q3	us-gaap	Investments Investments	4682815000	usd
CY2021Q4	us-gaap	Investments Investments	5142589000	usd
CY2022Q3	us-gaap	Cash Cash	335886000	usd
CY2021Q4	us-gaap	Cash Cash	335557000	usd
CY2022Q3	us-gaap	Premiums Receivable Gross PremiumsReceivableGross	646942000	usd
CY2021Q4	us-gaap	Premiums Receivable Gross PremiumsReceivableGross	621740000	usd
CY2022Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	usd
CY2021Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	usd
CY2022Q3	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	640942000	usd
CY2021Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	615740000	usd
CY2022Q3	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	48894000	usd
CY2021Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	43299000	usd
CY2022Q3	us-gaap	Other Receivables OtherReceivables	7871000	usd
CY2021Q4	us-gaap	Other Receivables OtherReceivables	7600000	usd
CY2022Q3	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	697707000	usd
CY2021Q4	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	666639000	usd
CY2022Q3	us-gaap	Reinsurance Receivables Case Basis ReinsuranceReceivablesCaseBasis	25309000	usd
CY2021Q4	us-gaap	Reinsurance Receivables Case Basis ReinsuranceReceivablesCaseBasis	45000000	usd
CY2022Q3	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	279726000	usd
CY2021Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	258259000	usd
CY2022Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	325461000	usd
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	308997000	usd
CY2022Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	189753000	usd
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	191332000	usd
CY2022Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	23610000	usd
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	31967000	usd
CY2022Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	48429000	usd
CY2021Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	20108000	usd
CY2022Q3	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	65705000	usd
CY2021Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	0	usd
CY2022Q3	us-gaap	Goodwill Goodwill	42796000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	42796000	usd
CY2022Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	9455000	usd
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	10255000	usd
CY2022Q3	us-gaap	Other Assets OtherAssets	53470000	usd
CY2021Q4	us-gaap	Other Assets OtherAssets	27970000	usd
CY2022Q3	us-gaap	Assets Assets	6454661000	usd
CY2021Q4	us-gaap	Assets Assets	6772472000	usd
CY2022Q3	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	2432734000	usd
CY2021Q4	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	2226430000	usd
CY2022Q3	us-gaap	Unearned Premiums UnearnedPremiums	1635459000	usd
CY2021Q4	us-gaap	Unearned Premiums UnearnedPremiums	1519799000	usd
CY2022Q3	us-gaap	Notes Payable NotesPayable	373230000	usd
CY2021Q4	us-gaap	Notes Payable NotesPayable	372931000	usd
CY2022Q3	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	155441000	usd
CY2021Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	169125000	usd
CY2022Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	26366000	usd
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	34577000	usd
CY2022Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	0	usd
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	53569000	usd
CY2022Q3	us-gaap	Other Liabilities OtherLiabilities	284950000	usd
CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	255760000	usd
CY2022Q3	us-gaap	Liabilities Liabilities	4908180000	usd
CY2021Q4	us-gaap	Liabilities Liabilities	4632191000	usd
CY2022Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	70000000	shares
CY2022Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	70000000	shares
CY2022Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	55371000	shares
CY2022Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	55371000	shares
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	55371000	shares
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	55371000	shares
CY2022Q3	us-gaap	Common Stock Value CommonStockValue	98947000	usd
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	98943000	usd
CY2022Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1447534000	usd
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2041338000	usd
CY2022Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1546481000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2140281000	usd
CY2022Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6454661000	usd
	us-gaap	Other Income OtherIncome	7883000	usd
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6772472000	usd
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	us-gaap	Premiums Earned Net PremiumsEarnedNet	2783682000	usd
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CY2021Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	32334000	usd
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	118469000	usd
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	95566000	usd
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	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-581237000	usd
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CY2021Q3	us-gaap	Other Income OtherIncome	2481000	usd
	us-gaap	Other Income OtherIncome	7141000	usd
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	us-gaap	Revenues Revenues	2491373000	usd
	us-gaap	Revenues Revenues	2944084000	usd
CY2022Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	787462000	usd
CY2021Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	697947000	usd
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	2436175000	usd
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1981519000	usd
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CY2021Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	153142000	usd
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	487444000	usd
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	468556000	usd
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	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	208305000	usd
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	216723000	usd
CY2022Q3	us-gaap	Interest Expense InterestExpense	4273000	usd
CY2021Q3	us-gaap	Interest Expense InterestExpense	4267000	usd
	us-gaap	Interest Expense InterestExpense	12822000	usd
	us-gaap	Interest Expense InterestExpense	12845000	usd
CY2022Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	1029190000	usd
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	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	3144746000	usd
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2679643000	usd
CY2022Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-128903000	usd
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-3381000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-653373000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	264441000	usd
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	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-147471000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	46977000	usd
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	us-gaap	Net Income Loss NetIncomeLoss	-505902000	usd
	us-gaap	Net Income Loss NetIncomeLoss	217464000	usd
CY2022Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.78
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.02
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-9.14
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.93
CY2022Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.78
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.02
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-9.14
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.93
CY2022Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55371000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55371000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55371000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55367000	shares
CY2022Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55371000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55375000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55371000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55375000	shares
CY2022Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1546481000	usd
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2144933000	usd
CY2022Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1546481000	usd
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2144933000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-505902000	usd
	us-gaap	Net Income Loss NetIncomeLoss	217464000	usd
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	64647000	usd
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	56864000	usd
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-581237000	usd
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	56953000	usd
	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	25202000	usd
	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	58529000	usd
	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	-19691000	usd
	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	1437000	usd
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	147595000	usd
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	22454000	usd
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	21467000	usd
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	16280000	usd
	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	206304000	usd
	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	150817000	usd
	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	115660000	usd
	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	139424000	usd
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-11708000	usd
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-12958000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	15000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	106000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	9191000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	31965000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	284871000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	428029000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1299431000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1044819000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	621519000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	117754000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	388421000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	397524000	usd
	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	755838000	usd
	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	695393000	usd
	us-gaap	Proceeds From Sale Of Equity Securities Fv Ni ProceedsFromSaleOfEquitySecuritiesFvNi	843283000	usd
	us-gaap	Proceeds From Sale Of Equity Securities Fv Ni ProceedsFromSaleOfEquitySecuritiesFvNi	689484000	usd
	us-gaap	Increase Decrease In Broker Dealer Related Receivables Payables Net IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet	11303000	usd
	us-gaap	Increase Decrease In Broker Dealer Related Receivables Payables Net IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet	-20267000	usd
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-39634000	usd
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-213553000	usd
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	25589000	usd
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	29498000	usd
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-3811000	usd
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1842000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-195493000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-329286000	usd
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	87902000	usd
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	105066000	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	215000	usd
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1147000	usd
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	765000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-89049000	usd
CY2021Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	153100000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-105616000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	329000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-6873000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	335557000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	348479000	usd
CY2022Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	335886000	usd
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	341606000	usd
	us-gaap	Interest Paid Net InterestPaidNet	16612000	usd
	us-gaap	Interest Paid Net InterestPaidNet	16584000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	179000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	69432000	usd
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	487400000	usd
	us-gaap	Use Of Estimates UseOfEstimates	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. These estimates require the Company to apply complex assumptions and judgments, and often the Company must make estimates about the effects of matters that are inherently uncertain and will likely change in subsequent periods. The most significant assumptions in the preparation of these consolidated financial statements relate to reserves for losses and loss adjustment expenses ("LAE"). Actual results could differ from those estimates. See Note 1. Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021
CY2022Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	18000	shares
	mcy	Incremental Securities Excluded From Computation Of Earnings Per Share Amount IncrementalSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1294	shares
CY2021Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2022Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3175
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.6325
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.5875
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.8975
CY2022Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	168900000	usd
CY2022Q3	us-gaap	Advertising Expense AdvertisingExpense	2300000	usd
CY2021Q3	us-gaap	Advertising Expense AdvertisingExpense	19400000	usd
	us-gaap	Advertising Expense AdvertisingExpense	10000000	usd
	us-gaap	Advertising Expense AdvertisingExpense	40700000	usd
CY2022Q3	us-gaap	Reinsurance Recoverables Gross ReinsuranceRecoverablesGross	25000000	usd
	us-gaap	Reinsurance Retention Policy Reinsured Risk Percentage ReinsuranceRetentionPolicyReinsuredRiskPercentage	0.735
CY2022Q3	us-gaap	Ceded Premiums Earned CededPremiumsEarned	23000000	usd
CY2021Q3	us-gaap	Ceded Premiums Earned CededPremiumsEarned	17000000	usd
	us-gaap	Ceded Premiums Earned CededPremiumsEarned	57000000	usd
	us-gaap	Ceded Premiums Earned CededPremiumsEarned	48000000	usd
CY2022Q3	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	2000000	usd
CY2021Q3	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	1000000	usd
	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	15000000	usd
	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	4000000	usd
CY2022Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	4500000	usd
CY2021Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	4600000	usd
CY2022Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2500000	usd
CY2021Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	3000000	usd
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	13500000	usd
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	15900000	usd
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	8000000	usd
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	9900000	usd
CY2021Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	0	usd
CY2022Q3	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	0	usd
CY2022Q3	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	0	usd
CY2021Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	0	usd
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0	usd
CY2022Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0	usd
CY2021Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts Recoveries PremiumsReceivableAllowanceForDoubtfulAccountsRecoveries	144000	usd
	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	0	usd
	us-gaap	Premiums Receivable Allowance For Doubtful Accounts Recoveries PremiumsReceivableAllowanceForDoubtfulAccountsRecoveries	468000	usd
	us-gaap	Premiums Receivable Allowance For Doubtful Accounts Recoveries PremiumsReceivableAllowanceForDoubtfulAccountsRecoveries	447000	usd
CY2022Q2	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	usd
CY2021Q2	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	usd
CY2021Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	usd
CY2020Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	10000000	usd
CY2022Q3	us-gaap	Premium Receivable Credit Loss Expense Reversal PremiumReceivableCreditLossExpenseReversal	-1153000	usd
CY2021Q3	us-gaap	Premium Receivable Credit Loss Expense Reversal PremiumReceivableCreditLossExpenseReversal	-694000	usd
	us-gaap	Premium Receivable Credit Loss Expense Reversal PremiumReceivableCreditLossExpenseReversal	-3330000	usd
	us-gaap	Premium Receivable Credit Loss Expense Reversal PremiumReceivableCreditLossExpenseReversal	1837000	usd
CY2022Q3	mcy	Premium Receivable Allowancefor Credit Loss Writeoff PremiumReceivableAllowanceforCreditLossWriteoff	1311000	usd
CY2021Q3	mcy	Premium Receivable Allowancefor Credit Loss Writeoff PremiumReceivableAllowanceforCreditLossWriteoff	838000	usd
	mcy	Premium Receivable Allowancefor Credit Loss Writeoff PremiumReceivableAllowanceforCreditLossWriteoff	3798000	usd
	mcy	Premium Receivable Allowancefor Credit Loss Writeoff PremiumReceivableAllowanceforCreditLossWriteoff	2610000	usd
CY2022Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts Recoveries PremiumsReceivableAllowanceForDoubtfulAccountsRecoveries	158000	usd
CY2022Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	usd
CY2021Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	usd
CY2022Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	usd
CY2021Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	usd
CY2022Q3	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	75962000	usd
CY2022Q3	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	-127219000	usd
CY2021Q3	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	-46131000	usd
	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	-549775000	usd
	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	25182000	usd
	mcy	Percentage Of Unadjusted Fair Value Obtained PercentageOfUnadjustedFairValueObtained	0.978
CY2022Q3	mcy	Three Private Equity Funds Using Nav ThreePrivateEquityFundsUsingNAV	92100000	usd
	mcy	Fair Value Assets Level1 To Level2 To Level3 Transfers Amount FairValueAssetsLevel1ToLevel2ToLevel3TransfersAmount	0	usd
	mcy	Fair Value Assets Level1 To Level2 To Level3 Transfers Amount FairValueAssetsLevel1ToLevel2ToLevel3TransfersAmount	0	usd
CY2021Q3	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	usd
CY2022Q3	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	usd
	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	usd
	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	usd
CY2021Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	usd
CY2022Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	usd
CY2021Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2022Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	66507000	usd
CY2022Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	9455000	usd
CY2021Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	75962000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	65707000	usd
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	10255000	usd
CY2021Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2022Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2021Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	300000	usd
CY2022Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	300000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	800000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	800000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	243000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	879000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	851000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	807000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	807000	usd
CY2022Q3	mcy	Finite Lived Intangible Asset Expected Amortization After Year Four FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour	4468000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	8055000	usd
CY2018Q1	mcy	Numberof Executives NumberofExecutives	4	executive
CY2022Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	8.09
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.3318
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0262
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0540
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P72M
	us-gaap	Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense	<div style="text-align:justify;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The following table presents the activity in loss and loss adjustment expense reserves:</span></div><div style="margin-top:5pt;text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:73.900%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:11.034%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.530%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:11.036%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td colspan="9" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">Nine Months Ended September 30,</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">2022</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">2021</span></td></tr><tr style="height:3pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td colspan="9" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">(Amounts in thousands)</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Gross reserves, beginning of period</span></td><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">2,226,430 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">1,991,304 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><div style="padding-left:18pt;text-indent:-4.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Reinsurance recoverables on unpaid losses, beginning of period</span></div></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">(41,377)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">(54,460)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Net reserves, beginning of period</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">2,185,053 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">1,936,844 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Incurred losses and loss adjustment expenses related to:</span></td><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Current year</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">2,386,233 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">2,005,233 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Prior years</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">49,942 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">(23,714)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 30.25pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Total incurred losses and loss adjustment expenses</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">2,436,175 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">1,981,519 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Loss and loss adjustment expense payments related to:</span></td><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Current year</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">1,267,535 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">1,088,285 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Prior years</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">945,371 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">739,385 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 30.25pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Total payments</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">2,212,906 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">1,827,670 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Net reserves, end of period</span></td><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">2,408,322 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">2,090,693 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Reinsurance recoverables on unpaid losses, end of period</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">24,412 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">51,428 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Gross reserves, end of period</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">2,432,734 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">2,142,121 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr></table></div>
CY2021Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	2226430000	usd
CY2020Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1991304000	usd
CY2021Q4	mcy	Reissuance Recoverable ReissuanceRecoverable	41377000	usd
CY2020Q4	mcy	Reissuance Recoverable ReissuanceRecoverable	54460000	usd
CY2021Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	2185053000	usd
CY2020Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1936844000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	2386233000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	2005233000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	49942000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-23714000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	2436175000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	1981519000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	1267535000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	1088285000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	945371000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	739385000	usd
	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	2212906000	usd
	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	1827670000	usd
CY2022Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	2408322000	usd
CY2021Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	2090693000	usd
CY2022Q3	mcy	Reissuance Recoverable ReissuanceRecoverable	24412000	usd
CY2021Q3	mcy	Reissuance Recoverable ReissuanceRecoverable	51428000	usd
CY2022Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	2432734000	usd
CY2021Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	2142121000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	49900000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-23700000	usd
CY2022Q3	mcy	Notes Payable Principal NotesPayablePrincipal	375000000	usd
CY2021Q4	mcy	Notes Payable Principal NotesPayablePrincipal	375000000	usd
CY2022Q3	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	1770000	usd
CY2021Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	2069000	usd
CY2022Q3	us-gaap	Notes Payable NotesPayable	373230000	usd
CY2021Q4	us-gaap	Notes Payable NotesPayable	372931000	usd
CY2017Q1	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.044
CY2017Q1	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	3400000	usd
CY2017Q1	mcy	Debt Instrument Discount Percent DebtInstrumentDiscountPercent	0.99847
CY2017Q1	us-gaap	Debt Instrument Interest Rate Effective Percentage DebtInstrumentInterestRateEffectivePercentage	0.0445
CY2022Q3	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	0.195
CY2022Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	200000	usd
	us-gaap	Increase Decrease In Unearned Premiums Net IncreaseDecreaseInUnearnedPremiumsNet	128000000	usd
	mcy	Number Of Subsidiaries Company Controls NumberOfSubsidiariesCompanyControls	13	subsidiary
CY2022Q3	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	11	state
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2022Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	996900000	usd
CY2021Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	940900000	usd
CY2022Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	787500000	usd
CY2021Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	697900000	usd
CY2022Q3	us-gaap	Other Underwriting Expense OtherUnderwritingExpense	237400000	usd
CY2021Q3	us-gaap	Other Underwriting Expense OtherUnderwritingExpense	233400000	usd
CY2022Q3	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	-28000000.0	usd
CY2021Q3	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	9600000	usd
CY2022Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	44600000	usd
CY2021Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	32300000	usd
CY2022Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-144200000	usd
CY2021Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-43500000	usd
CY2022Q3	us-gaap	Other Income OtherIncome	3000000.0	usd
CY2021Q3	us-gaap	Other Income OtherIncome	2500000	usd
CY2022Q3	us-gaap	Interest Expense InterestExpense	4300000	usd
CY2021Q3	us-gaap	Interest Expense InterestExpense	4300000	usd
CY2022Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-128900000	usd
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-3400000	usd
CY2022Q3	us-gaap	Net Income Loss NetIncomeLoss	-98300000	usd
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	1300000	usd
	us-gaap	Premiums Earned Net PremiumsEarnedNet	2947000000	usd
	us-gaap	Premiums Earned Net PremiumsEarnedNet	2783700000	usd
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	2436200000	usd
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1981500000	usd
	us-gaap	Other Underwriting Expense OtherUnderwritingExpense	695800000	usd
	us-gaap	Other Underwriting Expense OtherUnderwritingExpense	685500000	usd
	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	-185000000.0	usd
	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	116700000	usd
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	118500000	usd
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	95600000	usd
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-581200000	usd
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	57000000.0	usd
	us-gaap	Other Income OtherIncome	7100000	usd
	us-gaap	Other Income OtherIncome	7900000	usd
	us-gaap	Interest Expense InterestExpense	12800000	usd
	us-gaap	Interest Expense InterestExpense	12800000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-653400000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	264400000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-505900000	usd
	us-gaap	Net Income Loss NetIncomeLoss	217500000	usd
CY2022Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	996900000	usd
CY2021Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	940900000	usd
CY2022Q3	us-gaap	Direct Premiums Written DirectPremiumsWritten	1057100000	usd
CY2021Q3	us-gaap	Direct Premiums Written DirectPremiumsWritten	1032100000	usd
	us-gaap	Premiums Earned Net PremiumsEarnedNet	2947000000	usd
	us-gaap	Premiums Earned Net PremiumsEarnedNet	2783700000	usd
	us-gaap	Direct Premiums Written DirectPremiumsWritten	3109500000	usd
	us-gaap	Direct Premiums Written DirectPremiumsWritten	2958400000	usd

Files In Submission

Name	View Source	Status
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0000064996-22-000023-index.html	Edgar Link	pending
0000064996-22-000023.txt	Edgar Link	pending
0000064996-22-000023-xbrl.zip	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
mcy-20220930.htm	Edgar Link	pending
mcy-20220930.xsd	Edgar Link	pending
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mcy-2022930x10qxex312.htm	Edgar Link	pending
mcy-2022930x10qxex321.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending
mcy-20220930_pre.xml	Edgar Link	unprocessable

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$MCY
MERCURY GENERAL CORP Stock $mcy

2022 Q4 Form 10-Q Financial Statement

#000006499622000023 Filed on November 01, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MCY MERCURY GENERAL CORP Stock $mcy

2022 Q4 Form 10-Q Financial Statement

#000006499622000023 Filed on November 01, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MCY
MERCURY GENERAL CORP Stock $mcy