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Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
20% of net unearned premium $ 71,907us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve $ 68,586us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve
Discounting of loss reserves and salvage and subrogation recoverable for tax purposes 11,100us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves 12,810us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Write-down of impaired investments 942us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses 1,714us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Tax credit carryforward 31,198us-gaap_TaxCreditCarryforwardDeferredTaxAsset 40,309us-gaap_TaxCreditCarryforwardDeferredTaxAsset
Expense accruals 13,395us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves 12,497us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Other deferred tax assets 7,448us-gaap_DeferredTaxAssetsOther 5,653us-gaap_DeferredTaxAssetsOther
Total gross deferred tax assets 135,990us-gaap_DeferredTaxAssetsGross 141,569us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Deferred acquisition costs (69,021)mcy_DeferredTaxLiabilitiesAcquisitionCosts (68,063)mcy_DeferredTaxLiabilitiesAcquisitionCosts
Tax liability on net unrealized gain on securities carried at fair value (47,333)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities (33,964)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities
Tax depreciation in excess of book depreciation (9,414)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (9,667)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Undistributed earnings of insurance subsidiaries (4,486)mcy_DeferredTaxLiabilitiesUndistributedInsuranceSubsidiaries (4,024)mcy_DeferredTaxLiabilitiesUndistributedInsuranceSubsidiaries
Tax amortization in excess of book amortization (1,982)mcy_DeferredTaxLiabilitiesTaxAmortizationInExcessOfBookAmortization (1,447)mcy_DeferredTaxLiabilitiesTaxAmortizationInExcessOfBookAmortization
Other deferred tax liabilities (9,087)us-gaap_DeferredTaxLiabilitiesOther (9,184)us-gaap_DeferredTaxLiabilitiesOther
Total gross deferred tax liabilities (141,323)us-gaap_DeferredTaxLiabilities (126,349)us-gaap_DeferredTaxLiabilities
Net deferred tax (liabilities) assets $ (5,333)us-gaap_DeferredTaxAssetsLiabilitiesNet $ 15,220us-gaap_DeferredTaxAssetsLiabilitiesNet