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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 177,949us-gaap_NetIncomeLoss	$ 112,143us-gaap_NetIncomeLoss	$ 116,911us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	28,054us-gaap_DepreciationAmortizationAndAccretionNet	30,587us-gaap_DepreciationAmortizationAndAccretionNet	36,974us-gaap_DepreciationAmortizationAndAccretionNet
Net realized investment (gains) losses	(81,184)us-gaap_RealizedInvestmentGainsLosses	11,422us-gaap_RealizedInvestmentGainsLosses	(66,380)us-gaap_RealizedInvestmentGainsLosses
Bond amortization, net	18,918us-gaap_AmortizationOfDebtDiscountPremium	12,529us-gaap_AmortizationOfDebtDiscountPremium	6,757us-gaap_AmortizationOfDebtDiscountPremium
Excess tax benefit from exercise of stock options	(148)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	(202)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	(86)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Increase in premiums receivable	(23,934)us-gaap_IncreaseDecreaseInPremiumsReceivable	(20,688)us-gaap_IncreaseDecreaseInPremiumsReceivable	(56,588)us-gaap_IncreaseDecreaseInPremiumsReceivable
Changes in current and deferred income taxes	8,343us-gaap_IncreaseDecreaseInDeferredIncomeTaxes	3,451us-gaap_IncreaseDecreaseInDeferredIncomeTaxes	(83)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Increase in deferred policy acquisition costs	(2,736)us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts	(8,556)us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts	(14,480)us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts
Increase in unpaid losses and loss adjustment expenses	52,813us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve	2,861us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve	50,844us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve
Increase in unearned premiums	46,271us-gaap_IncreaseDecreaseInUnearnedPremiums	33,098us-gaap_IncreaseDecreaseInUnearnedPremiums	77,002us-gaap_IncreaseDecreaseInUnearnedPremiums
Increase in accounts payable and accrued expenses	31,019us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	30,367us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	1,197us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Share-based compensation	(4,112)us-gaap_ShareBasedCompensation	(974)us-gaap_ShareBasedCompensation	(370)us-gaap_ShareBasedCompensation
(Decrease) increase in other payables	(10,988)us-gaap_IncreaseDecreaseInOtherAccountsPayable	12,135us-gaap_IncreaseDecreaseInOtherAccountsPayable	2,545us-gaap_IncreaseDecreaseInOtherAccountsPayable
Other, net	(1,954)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities	(10,317)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities	(6,181)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by operating activities	246,535us-gaap_NetCashProvidedByUsedInOperatingActivities	209,804us-gaap_NetCashProvidedByUsedInOperatingActivities	148,062us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES
Fixed maturity securities available-for-sale in nature: Purchases	(542,494)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt	(831,796)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt	(590,562)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
Fixed maturity securities available-for-sale in nature: Sales	209,680us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	228,116us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	139,860us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Fixed maturity securities available-for-sale in nature: Calls or maturities	330,637us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	343,628us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	528,886us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Equity securities available for sale in nature:
Purchases	(868,383)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity	(596,883)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity	(358,216)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity
Sales	745,058us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	872,997us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	277,272us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
Calls	1,044mcy_ProceedsFromCallsOfAvailableForSaleSecurities	0mcy_ProceedsFromCallsOfAvailableForSaleSecurities	923mcy_ProceedsFromCallsOfAvailableForSaleSecurities
Changes in securities payable and receivable	9,294us-gaap_IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet	1,702us-gaap_IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet	1,919us-gaap_IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet
Net increase in short-term investments	(56,530)us-gaap_PaymentsToAcquireShortTermInvestments	(20,005)us-gaap_PaymentsToAcquireShortTermInvestments	(58,949)us-gaap_PaymentsToAcquireShortTermInvestments
Purchase of fixed assets	(26,037)us-gaap_PaymentsToAcquireProductiveAssets	(18,671)us-gaap_PaymentsToAcquireProductiveAssets	(15,177)us-gaap_PaymentsToAcquireProductiveAssets
Sale of fixed assets	224us-gaap_ProceedsFromSaleOfProductiveAssets	820us-gaap_ProceedsFromSaleOfProductiveAssets	2,044us-gaap_ProceedsFromSaleOfProductiveAssets
Other, net	3,472us-gaap_PaymentsForProceedsFromOtherInvestingActivities	1,741us-gaap_PaymentsForProceedsFromOtherInvestingActivities	2,255us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities	(194,035)us-gaap_NetCashProvidedByUsedInInvestingActivities	(18,351)us-gaap_NetCashProvidedByUsedInInvestingActivities	(69,745)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(135,496)us-gaap_PaymentsOfDividendsCommonStock	(134,776)us-gaap_PaymentsOfDividendsCommonStock	(134,105)us-gaap_PaymentsOfDividendsCommonStock
Excess tax benefit from exercise of stock options	148us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	202us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	86us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds from stock options exercised	6,247us-gaap_ProceedsFromStockOptionsExercised	1,446us-gaap_ProceedsFromStockOptionsExercised	2,492us-gaap_ProceedsFromStockOptionsExercised
Proceeds from bank loan	100,000us-gaap_ProceedsFromBankDebt	50,000us-gaap_ProceedsFromBankDebt	0us-gaap_ProceedsFromBankDebt
Net cash used in financing activities	(29,101)us-gaap_NetCashProvidedByUsedInFinancingActivities	(83,128)us-gaap_NetCashProvidedByUsedInFinancingActivities	(131,527)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash	23,399us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	108,325us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	(53,210)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash:
Beginning of year	266,508us-gaap_Cash	158,183us-gaap_Cash	211,393us-gaap_Cash
End of year	289,907us-gaap_Cash	266,508us-gaap_Cash	158,183us-gaap_Cash
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	2,543us-gaap_InterestPaid	998us-gaap_InterestPaid	1,690us-gaap_InterestPaid
Income taxes paid	$ 61,139us-gaap_IncomeTaxesPaid	$ 16,503us-gaap_IncomeTaxesPaid	$ 18,481us-gaap_IncomeTaxesPaid

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