$MCY
MERCURY GENERAL CORP Stock $mcy

$mcy Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-Q Financial Statement

#000006499621000031 Filed on November 02, 2021

Income Statement

Concept	2021 Q4	2021 Q3	2020 Q3
Revenue	$1.049B	$932.2M	$998.8M
YoY Change	-2.08%	-6.66%	1.16%
Cost Of Revenue		$3.000M	$2.800M
YoY Change		7.14%	12.0%
Gross Profit		$929.2M	$996.0M
YoY Change		-6.7%	1.14%
Gross Profit Margin		99.68%	99.72%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$27.21M	$153.1M	$157.4M
YoY Change	21.46%	-2.73%	4.31%
% of Gross Profit		16.48%	15.8%
Operating Expenses	$1.010B	$931.3M	$847.9M
YoY Change	17.43%	9.84%	-6.02%
Operating Profit		-$2.114M	$148.1M
YoY Change		-101.43%	79.28%
Interest Expense	-$4.268M	$4.300M	$4.300M
YoY Change	-0.74%	0.0%	0.0%
% of Operating Profit			2.9%
Other Income/Expense, Net
YoY Change
Pretax Income	$34.87M	-$3.400M	$146.6M
YoY Change	-83.17%	-102.32%	81.35%
Income Tax	$4.393M	-$4.669M	$27.77M
% Of Pretax Income	12.6%		18.95%
Net Earnings	$30.47M	$1.300M	$118.9M
YoY Change	-81.72%	-98.91%	71.62%
Net Earnings / Revenue	2.9%	0.14%	11.9%
Basic Earnings Per Share		$0.02	$2.15
Diluted Earnings Per Share	$550.3K	$0.02	$2.15
COMMON SHARES
Basic Shares Outstanding	55.37M shares	55.37M shares	55.36M shares
Diluted Shares Outstanding		55.38M shares	55.36M shares

Balance Sheet

Concept	2021 Q4	2021 Q3	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$335.6M	$341.6M	$322.1M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$7.600M	$7.258M	$10.00M
YoY Change	-28.97%	-27.42%	78.57%
LONG-TERM ASSETS
Property, Plant & Equipment	$191.3M	$185.9M	$174.9M
YoY Change	6.94%	6.29%	3.94%
Goodwill	$42.80M	$42.80M	$42.80M
YoY Change	0.0%	0.0%	0.0%
Intangibles	$10.26M	$10.52M	$9.939M
YoY Change	-9.42%	5.87%	-16.5%
Long-Term Investments	$5.143B	$5.075B	$4.549B
YoY Change	8.74%	11.56%	7.84%
Other Assets		$10.42M
YoY Change
Total Long-Term Assets	$6.765B	$6.747B	$6.136B
YoY Change	7.08%	9.96%	4.57%
TOTAL ASSETS
Total Short-Term Assets	$7.600M	$7.258M	$10.00M
Total Long-Term Assets	$6.765B	$6.747B	$6.136B
Total Assets	$6.772B	$6.754B	$6.146B
YoY Change	7.02%	9.9%	4.64%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$169.1M	$182.1M	$180.3M
YoY Change	-13.0%	1.02%	15.36%
Accrued Expenses	$34.58M	$36.84M	$44.60M
YoY Change	-21.06%	-17.39%	-8.42%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$203.7M	$219.0M	$231.3M
YoY Change	-18.06%	-5.33%	12.83%
LONG-TERM LIABILITIES
Long-Term Debt	$372.9M	$372.8M	$372.4M
YoY Change	0.12%	0.12%	0.11%
Other Long-Term Liabilities	$255.8M	$290.7M	$246.7M
YoY Change	8.33%	17.83%	5.7%
Total Long-Term Liabilities	$628.7M	$663.5M	$619.1M
YoY Change	3.3%	7.17%	2.26%
TOTAL LIABILITIES
Total Short-Term Liabilities	$203.7M	$219.0M	$231.3M
Total Long-Term Liabilities	$628.7M	$663.5M	$619.1M
Total Liabilities	$4.632B	$4.609B	$4.245B
YoY Change	7.83%	8.59%	4.28%
SHAREHOLDERS EQUITY
Retained Earnings	$2.041B	$2.046B	$1.802B
YoY Change	5.57%	13.55%	5.75%
Common Stock	$98.94M	$98.91M	$98.93M
YoY Change	-0.03%	-0.03%	0.25%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.140B	$2.145B	$1.901B
YoY Change
Total Liabilities & Shareholders Equity	$6.772B	$6.754B	$6.146B
YoY Change	7.02%	9.9%	4.64%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2020 Q3
OPERATING ACTIVITIES
Net Income	$30.47M	$1.300M	$118.9M
YoY Change	-81.72%	-98.91%	71.62%
Depreciation, Depletion And Amortization	$27.21M	$153.1M	$157.4M
YoY Change	21.46%	-2.73%	4.31%
Cash From Operating Activities	$73.56M	$110.8M	$183.7M
YoY Change	-54.68%	-39.69%	24.12%
INVESTING ACTIVITIES
Capital Expenditures	-$11.94M	-$11.70M	-$10.00M
YoY Change	17.1%	16.96%	-8.26%
Acquisitions
YoY Change
Other Investing Activities	-$32.44M	-$100.7M	-$78.80M
YoY Change	-64.04%	27.79%	189.71%
Cash From Investing Activities	-$44.38M	-$112.4M	-$88.80M
YoY Change	-55.79%	26.57%	132.46%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-35.22M	-35.40M	-34.80M
YoY Change	-1.07%	1.72%	0.29%
NET CHANGE
Cash From Operating Activities	73.56M	110.8M	183.7M
Cash From Investing Activities	-44.38M	-112.4M	-88.80M
Cash From Financing Activities	-35.22M	-35.40M	-34.80M
Net Change In Cash	-6.049M	-37.01M	60.10M
YoY Change	-123.0%	-161.58%	-19.97%
FREE CASH FLOW
Cash From Operating Activities	$73.56M	$110.8M	$183.7M
Capital Expenditures	-$11.94M	-$11.70M	-$10.00M
Free Cash Flow	$85.50M	$122.5M	$193.7M
YoY Change	-50.44%	-36.77%	21.9%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Entity Central Index Key EntityCentralIndexKey	0000064996
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-09-30
	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
CY2021Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	55370788	shares
CY2021Q3	mcy	Amortized Cost On Fixed Maturity Trading Investments AmortizedCostOnFixedMaturityTradingInvestments	3850850000	USD
CY2020Q4	mcy	Amortized Cost On Fixed Maturity Trading Investments AmortizedCostOnFixedMaturityTradingInvestments	3388418000	USD
CY2021Q3	us-gaap	Trading Securities Debt TradingSecuritiesDebt	3990513000	USD
CY2020Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	3549810000	USD
CY2021Q3	mcy	Cost Equity Security Trading Investments CostEquitySecurityTradingInvestments	734861000	USD
CY2020Q4	mcy	Cost Equity Security Trading Investments CostEquitySecurityTradingInvestments	695150000	USD
CY2021Q3	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	890620000	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	803851000	USD
CY2021Q3	mcy	Cost Short Term Investments CostShortTermInvestments	194721000	USD
CY2020Q4	mcy	Cost Short Term Investments CostShortTermInvestments	376547000	USD
CY2021Q3	us-gaap	Other Short Term Investments OtherShortTermInvestments	193621000	USD
CY2020Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	375609000	USD
CY2021Q3	us-gaap	Investments Investments	5074754000	USD
CY2020Q4	us-gaap	Investments Investments	4729270000	USD
CY2021Q3	us-gaap	Cash Cash	341606000	USD
CY2020Q4	us-gaap	Cash Cash	348479000	USD
CY2021Q3	us-gaap	Premiums Receivable Gross PremiumsReceivableGross	653599000	USD
CY2020Q4	us-gaap	Premiums Receivable Gross PremiumsReceivableGross	599070000	USD
CY2021Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	USD
CY2020Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	10000000	USD
CY2021Q3	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	647599000	USD
CY2020Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	589070000	USD
CY2021Q3	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	41546000	USD
CY2020Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	42985000	USD
CY2021Q3	us-gaap	Other Receivables OtherReceivables	7258000	USD
CY2020Q4	us-gaap	Other Receivables OtherReceivables	10730000	USD
CY2021Q3	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	696403000	USD
CY2020Q4	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	642785000	USD
CY2021Q3	us-gaap	Reinsurance Receivables Case Basis ReinsuranceReceivablesCaseBasis	49925000	USD
CY2020Q4	us-gaap	Reinsurance Receivables Case Basis ReinsuranceReceivablesCaseBasis	48579000	USD
CY2021Q3	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	0	USD
CY2020Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	91000	USD
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CY2020Q4	mcy	Reinsurance Recoverables Net ReinsuranceRecoverablesNet	48488000	USD
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CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	34038000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	40554000	USD
CY2021Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	10420000	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	0	USD
CY2021Q3	us-gaap	Goodwill Goodwill	42796000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	42796000	USD
CY2021Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	10522000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	11322000	USD
CY2021Q3	us-gaap	Other Assets OtherAssets	44701000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	38635000	USD
CY2021Q3	us-gaap	Assets Assets	6754373000	USD
CY2020Q4	us-gaap	Assets Assets	6328246000	USD
CY2021Q3	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	2142121000	USD
CY2020Q4	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	1991304000	USD
CY2021Q3	us-gaap	Unearned Premiums UnearnedPremiums	1545297000	USD
CY2020Q4	us-gaap	Unearned Premiums UnearnedPremiums	1405873000	USD
CY2021Q3	us-gaap	Notes Payable NotesPayable	372831000	USD
CY2020Q4	us-gaap	Notes Payable NotesPayable	372532000	USD
CY2021Q3	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	182138000	USD
CY2020Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	194421000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	36843000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	43825000	USD
CY2021Q3	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	0	USD
CY2020Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	10426000	USD
CY2021Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	39524000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	41132000	USD
CY2021Q3	us-gaap	Other Liabilities OtherLiabilities	290686000	USD
CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	236136000	USD
CY2021Q3	us-gaap	Liabilities Liabilities	4609440000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	4295649000	USD
CY2021Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	70000000	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	70000000	shares
CY2021Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	55371000	shares
CY2021Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	55371000	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	55358000	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	55358000	shares
CY2021Q3	us-gaap	Common Stock Value CommonStockValue	98908000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	98970000	USD
CY2021Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2046025000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1933627000	USD
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2144933000	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
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	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	95566000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	100801000	USD
CY2021Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-43543000	USD
CY2020Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	64436000	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	56953000	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-28458000	USD
CY2021Q3	us-gaap	Other Income OtherIncome	2481000	USD
CY2020Q3	us-gaap	Other Income OtherIncome	2894000	USD
	us-gaap	Other Income OtherIncome	7883000	USD
	us-gaap	Other Income OtherIncome	6810000	USD
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	us-gaap	Revenues Revenues	2944084000	USD
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	us-gaap	Revenues Revenues	2712928000	USD
CY2021Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	697947000	USD
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	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1765627000	USD
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	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	468556000	USD
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	463604000	USD
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CY2020Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	71859000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	216723000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	219519000	USD
CY2021Q3	us-gaap	Interest Expense InterestExpense	4267000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	4262000	USD
	us-gaap	Interest Expense InterestExpense	12845000	USD
	us-gaap	Interest Expense InterestExpense	12786000	USD
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	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2679643000	USD
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2461536000	USD
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CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	146631000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	264441000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	251392000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-4669000	USD
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	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	46977000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	43528000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	1288000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	118857000	USD
	us-gaap	Net Income Loss NetIncomeLoss	217464000	USD
	us-gaap	Net Income Loss NetIncomeLoss	207864000	USD
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.02
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.15
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.93
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.75
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	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.93
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.75
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55371000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55358000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55367000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55358000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55375000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55358000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55375000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55358000	shares
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1900832000	USD
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2144933000	USD
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2144933000	USD
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1900832000	USD
	us-gaap	Net Income Loss NetIncomeLoss	217464000	USD
	us-gaap	Net Income Loss NetIncomeLoss	207864000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	56864000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	50617000	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	56953000	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-28458000	USD
	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	58529000	USD
	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	18075000	USD
	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	1437000	USD
	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	-37241000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	22454000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-6075000	USD
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	16280000	USD
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	18296000	USD
	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	150817000	USD
	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	20731000	USD
	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	139424000	USD
	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	77002000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-12958000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	38879000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	106000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	106000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	31965000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	12650000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	428029000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	443252000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1044819000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	686541000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	117754000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	127336000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	397524000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	154180000	USD
	mcy	Paymentsto Acquire Equity Securities Fvni PaymentstoAcquireEquitySecuritiesFVNI	695393000	USD
	mcy	Paymentsto Acquire Equity Securities Fvni PaymentstoAcquireEquitySecuritiesFVNI	1001624000	USD
	mcy	Proceedsfrom Saleof Equity Securities Fvni ProceedsfromSaleofEquitySecuritiesFVNI	689484000	USD
	mcy	Proceedsfrom Saleof Equity Securities Fvni ProceedsfromSaleofEquitySecuritiesFVNI	849964000	USD
	mcy	Proceeds From Equity Securities Calls Of Equity Securities Available For Sale ProceedsFromEquitySecuritiesCallsOfEquitySecuritiesAvailableForSale	0	USD
	mcy	Proceeds From Equity Securities Calls Of Equity Securities Available For Sale ProceedsFromEquitySecuritiesCallsOfEquitySecuritiesAvailableForSale	3880000	USD
	us-gaap	Increase Decrease In Broker Dealer Related Receivables Payables Net IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet	-20267000	USD
	us-gaap	Increase Decrease In Broker Dealer Related Receivables Payables Net IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet	-11923000	USD
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-213553000	USD
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-240673000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	29498000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	29764000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1842000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-19078000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-329286000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-310895000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	105066000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	104626000	USD
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	215000	USD
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	765000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-105616000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-104626000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-6873000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	27731000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	348479000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	294398000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	341606000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	322129000	USD
	us-gaap	Interest Paid Net InterestPaidNet	16584000	USD
	us-gaap	Interest Paid Net InterestPaidNet	16573000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	69432000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	37453000	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, 2020
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
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	68000	shares
CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	68000	shares
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.6325
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.6300
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.8975
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.8900
CY2021Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	153100000	USD
CY2020Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	157400000	USD
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	468600000	USD
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	463600000	USD
CY2021Q3	us-gaap	Advertising Expense AdvertisingExpense	19400000	USD
CY2020Q3	us-gaap	Advertising Expense AdvertisingExpense	10800000	USD
	us-gaap	Advertising Expense AdvertisingExpense	40700000	USD
	us-gaap	Advertising Expense AdvertisingExpense	31700000	USD
CY2021Q3	us-gaap	Reinsurance Recoverables Gross ReinsuranceRecoverablesGross	31000000	USD
	us-gaap	Reinsurance Retention Policy Reinsured Risk Percentage ReinsuranceRetentionPolicyReinsuredRiskPercentage	0.71
	us-gaap	Reinsurance Retention Policy Excess Retention Amount Reinsured ReinsuranceRetentionPolicyExcessRetentionAmountReinsured	792000000	USD
	us-gaap	Reinsurance Retention Policy Amount Retained ReinsuranceRetentionPolicyAmountRetained	40000000	USD
CY2021Q3	us-gaap	Ceded Premiums Earned CededPremiumsEarned	17000000	USD
CY2020Q3	us-gaap	Ceded Premiums Earned CededPremiumsEarned	15000000	USD
	us-gaap	Ceded Premiums Earned CededPremiumsEarned	48000000	USD
	us-gaap	Ceded Premiums Earned CededPremiumsEarned	41000000	USD
CY2021Q3	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	1000000	USD
CY2020Q3	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	7000000	USD
	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	4000000	USD
	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	23000000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	4600000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	4500000	USD
CY2021Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	3000000	USD
CY2020Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2800000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	15900000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	13700000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	9900000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	9000000	USD
CY2021Q3	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	0	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	0	USD
CY2021Q3	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	0	USD
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	0	USD
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0	USD
CY2021Q3	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	4500000	USD
CY2020Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	4800000	USD
CY2021Q3	us-gaap	Capitalized Contract Cost Accumulated Amortization CapitalizedContractCostAccumulatedAmortization	4200000	USD
CY2020Q4	us-gaap	Capitalized Contract Cost Accumulated Amortization CapitalizedContractCostAccumulatedAmortization	2100000	USD
CY2021Q3	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	800000	USD
CY2020Q3	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	600000	USD
	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	2100000	USD
	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	1200000	USD
CY2021Q2	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	USD
CY2020Q2	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	10000000	USD
CY2020Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	10000000	USD
CY2019Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	1445000	USD
CY2021Q3	us-gaap	Premium Receivable Credit Loss Expense Reversal PremiumReceivableCreditLossExpenseReversal	-694000	USD
CY2020Q3	us-gaap	Premium Receivable Credit Loss Expense Reversal PremiumReceivableCreditLossExpenseReversal	-559000	USD
	us-gaap	Premium Receivable Credit Loss Expense Reversal PremiumReceivableCreditLossExpenseReversal	1837000	USD
	us-gaap	Premium Receivable Credit Loss Expense Reversal PremiumReceivableCreditLossExpenseReversal	-9448000	USD
CY2021Q3	mcy	Premium Receivable Allowancefor Credit Loss Writeoff PremiumReceivableAllowanceforCreditLossWriteoff	838000	USD
CY2020Q3	mcy	Premium Receivable Allowancefor Credit Loss Writeoff PremiumReceivableAllowanceforCreditLossWriteoff	735000	USD
	mcy	Premium Receivable Allowancefor Credit Loss Writeoff PremiumReceivableAllowanceforCreditLossWriteoff	2610000	USD
	mcy	Premium Receivable Allowancefor Credit Loss Writeoff PremiumReceivableAllowanceforCreditLossWriteoff	3279000	USD
CY2021Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts Recoveries PremiumsReceivableAllowanceForDoubtfulAccountsRecoveries	144000	USD
CY2020Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts Recoveries PremiumsReceivableAllowanceForDoubtfulAccountsRecoveries	176000	USD
	us-gaap	Premiums Receivable Allowance For Doubtful Accounts Recoveries PremiumsReceivableAllowanceForDoubtfulAccountsRecoveries	447000	USD
	us-gaap	Premiums Receivable Allowance For Doubtful Accounts Recoveries PremiumsReceivableAllowanceForDoubtfulAccountsRecoveries	531000	USD
CY2021Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	USD
CY2020Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	10000000	USD
CY2021Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	6000000	USD
CY2020Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	10000000	USD
CY2021Q2	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	0	USD
CY2020Q2	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	88000	USD
CY2020Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	91000	USD
CY2019Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	0	USD
CY2021Q3	us-gaap	Reinsurance Recoverable Credit Loss Expense Reversal ReinsuranceRecoverableCreditLossExpenseReversal	0	USD
CY2020Q3	us-gaap	Reinsurance Recoverable Credit Loss Expense Reversal ReinsuranceRecoverableCreditLossExpenseReversal	-30000	USD
	us-gaap	Reinsurance Recoverable Credit Loss Expense Reversal ReinsuranceRecoverableCreditLossExpenseReversal	-91000	USD
	us-gaap	Reinsurance Recoverable Credit Loss Expense Reversal ReinsuranceRecoverableCreditLossExpenseReversal	-101000	USD
CY2021Q3	us-gaap	Reinsurance Loss On Uncollectible Accounts In Period Amount ReinsuranceLossOnUncollectibleAccountsInPeriodAmount	0	USD
CY2020Q3	us-gaap	Reinsurance Loss On Uncollectible Accounts In Period Amount ReinsuranceLossOnUncollectibleAccountsInPeriodAmount	0	USD
	us-gaap	Reinsurance Loss On Uncollectible Accounts In Period Amount ReinsuranceLossOnUncollectibleAccountsInPeriodAmount	0	USD
	us-gaap	Reinsurance Loss On Uncollectible Accounts In Period Amount ReinsuranceLossOnUncollectibleAccountsInPeriodAmount	0	USD
CY2021Q3	us-gaap	Reinsurance Recoverable Allowance For Credit Loss Recovery ReinsuranceRecoverableAllowanceForCreditLossRecovery	0	USD
CY2020Q3	us-gaap	Reinsurance Recoverable Allowance For Credit Loss Recovery ReinsuranceRecoverableAllowanceForCreditLossRecovery	0	USD
	us-gaap	Reinsurance Recoverable Allowance For Credit Loss Recovery ReinsuranceRecoverableAllowanceForCreditLossRecovery	0	USD
	us-gaap	Reinsurance Recoverable Allowance For Credit Loss Recovery ReinsuranceRecoverableAllowanceForCreditLossRecovery	0	USD
CY2021Q3	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	0	USD
CY2020Q3	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	58000	USD
CY2021Q3	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	0	USD
CY2020Q3	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	58000	USD
	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	Recently Issued Accounting Standards <span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In March 2020, the Financial Accounting Standards Board ("FASB") issued ASU 2020-04, "</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Reference Rate Reform (Topic 848), Facilitation of the Effects of Reference Rate Reform on Financial Reporting.</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">" ASU 2020-04 provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments in this ASU apply only to contracts, hedging relationships, and other transactions that reference LIBOR or other interbank offered rates expected to be discontinued because of reference rate reform. ASU 2020-04 is effective for all entities as of March 12, 2020 through December 31, 2022. The Company expects to apply the optional expedients in this ASU to its unsecured credit facility that references LIBOR (see Note 11), when the facility is modified with a replacement rate before LIBOR is discontinued. The Company does not expect any material impact on its consolidated financial statements and related disclosures resulting from applying this ASU.</span>
CY2017Q3	mcy	Numberof Acres NumberofAcres	6	acre
CY2017Q3	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	12200000	USD
CY2017Q3	mcy	Promissory Note Receivedin Sale Of Property Plantand Equipment PromissoryNoteReceivedinSaleOfPropertyPlantandEquipment	5700000	USD
CY2017Q3	mcy	Stated Interest Rate On Promissory Note StatedInterestRateOnPromissoryNote	0.035
CY2021Q3	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	-46131000	USD
CY2020Q3	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	58865000	USD
	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	25182000	USD
	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	-15296000	USD
	mcy	Percentage Of Unadjusted Fair Value Obtained PercentageOfUnadjustedFairValueObtained	0.979
CY2021Q3	mcy	Two Private Equity Funds Using Nav TwoPrivateEquityFundsUsingNAV	105000000	USD
CY2021Q3	mcy	One Private Equity Fund Using Nav OnePrivateEquityFundUsingNAV	1200000	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
CY2020Q3	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
CY2020Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	USD
CY2021Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021Q3	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	75962000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	65440000	USD
CY2021Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	10522000	USD
CY2020Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	75962000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	64640000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	11322000	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021Q3	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
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	200000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	800000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	700000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	267000	USD
	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	254000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1043000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	879000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	851000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	807000	USD
CY2021Q3	mcy	Finite Lived Intangible Asset Expected Amortization After Year Four FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour	5275000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	9122000	USD
CY2018Q1	mcy	Numberof Executives NumberofExecutives	4	executive
CY2021Q3	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
CY2021Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	100000	USD
	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P0Y4M24D
	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%">2021</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%">2020</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%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">1,991,304 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">$</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%">1,921,255 </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%">(54,460)</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%">(76,100)</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:bottom"><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> Cumulative effect of adopting ASU 2016-13 for reinsurance recoverables on unpaid losses</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:5.85pt;font-weight:400;line-height:100%;position:relative;top:-3.15pt;vertical-align:baseline"> (1)</span></div></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%">— </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%">149 </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, as adjusted</span></div></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%">(54,460)</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%">(75,951)</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;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, as adjusted</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%">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"/><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%">1,845,304 </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%">2,005,233 </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%">1,740,116 </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%">(23,714)</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%">25,511 </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%">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"/><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%">1,765,627 </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%">1,088,285 </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%">937,373 </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%">739,385 </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%">786,180 </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%">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"/><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%">1,723,553 </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%">2,090,693 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><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%">1,887,378 </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%">51,428 </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%">54,608 </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%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">2,142,121 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">$</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%">1,941,986 </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><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">__________ </span></div>(1) See Note 1 for additional information on adoption of ASU 2016-13.
CY2020Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1991304000	USD
CY2019Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1921255000	USD
CY2020Q4	mcy	Reissuance Recoverable ReissuanceRecoverable	54460000	USD
CY2019Q4	mcy	Reissuance Recoverable ReissuanceRecoverable	76100000	USD
CY2020Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1936844000	USD
CY2019Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1845304000	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 Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	1740116000	USD
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-23714000	USD
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	25511000	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 Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	1765627000	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 Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	937373000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	739385000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	786180000	USD
	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	1827670000	USD
	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	1723553000	USD
CY2021Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	2090693000	USD
CY2020Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1887378000	USD
CY2021Q3	mcy	Reissuance Recoverable ReissuanceRecoverable	51428000	USD
CY2020Q3	mcy	Reissuance Recoverable ReissuanceRecoverable	54608000	USD
CY2021Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	2142121000	USD
CY2020Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1941986000	USD
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-23700000	USD
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	25500000	USD
CY2021Q3	mcy	Notes Payable Principal NotesPayablePrincipal	375000000	USD
CY2020Q4	mcy	Notes Payable Principal NotesPayablePrincipal	375000000	USD
CY2021Q3	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	2169000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	2468000	USD
CY2021Q3	us-gaap	Notes Payable NotesPayable	372831000	USD
CY2020Q4	us-gaap	Notes Payable NotesPayable	372532000	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
CY2021Q3	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	0.149
CY2021Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	200000	USD
	us-gaap	Increase Decrease In Unearned Premiums Net IncreaseDecreaseInUnearnedPremiumsNet	128000000	USD
CY2021Q3	mcy	Number Of Vehicle Individual Policies Mileage Reduction NumberOfVehicleIndividualPoliciesMileageReduction	310000	vehicle
	mcy	Number Of Subsidiaries Company Controls NumberOfSubsidiariesCompanyControls	14	Subsidiary
CY2021Q3	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	11	State
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2021Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	940900000	USD
CY2020Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	899300000	USD
CY2021Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	697900000	USD
CY2020Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	618700000	USD
CY2021Q3	us-gaap	Other Underwriting Expense OtherUnderwritingExpense	233400000	USD
CY2020Q3	us-gaap	Other Underwriting Expense OtherUnderwritingExpense	229100000	USD
CY2021Q3	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	9600000	USD
CY2020Q3	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	51500000	USD
CY2021Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	32300000	USD
CY2020Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	32100000	USD
CY2021Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-43500000	USD
CY2020Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	64400000	USD
CY2021Q3	us-gaap	Other Income OtherIncome	2500000	USD
CY2020Q3	us-gaap	Other Income OtherIncome	2900000	USD
CY2021Q3	us-gaap	Interest Expense InterestExpense	4300000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	4300000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-3400000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	146600000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	1300000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	118900000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	2783700000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	2633800000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1981500000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1765600000	USD
	us-gaap	Other Underwriting Expense OtherUnderwritingExpense	685500000	USD
	us-gaap	Other Underwriting Expense OtherUnderwritingExpense	683100000	USD
	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	116700000	USD
	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	185100000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	95600000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	100800000	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	57000000.0	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-28500000	USD
	us-gaap	Other Income OtherIncome	7900000	USD
	us-gaap	Other Income OtherIncome	6800000	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	264400000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	251400000	USD
	us-gaap	Net Income Loss NetIncomeLoss	217500000	USD
	us-gaap	Net Income Loss NetIncomeLoss	207900000	USD
CY2021Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	940900000	USD
CY2020Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	899300000	USD
CY2021Q3	us-gaap	Direct Premiums Written DirectPremiumsWritten	1032100000	USD
CY2020Q3	us-gaap	Direct Premiums Written DirectPremiumsWritten	957000000.0	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	2783700000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	2633800000	USD
	us-gaap	Direct Premiums Written DirectPremiumsWritten	2958400000	USD
	us-gaap	Direct Premiums Written DirectPremiumsWritten	2743700000	USD

Files In Submission

Name	View Source	Status
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$MCY
MERCURY GENERAL CORP Stock $mcy

2021 Q4 Form 10-Q Financial Statement

#000006499621000031 Filed on November 02, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MCY MERCURY GENERAL CORP Stock $mcy

2021 Q4 Form 10-Q Financial Statement

#000006499621000031 Filed on November 02, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MCY
MERCURY GENERAL CORP Stock $mcy