XML 58 R59.htm IDEA: XBRL DOCUMENT v2.4.1.9
Shareholders' Equity and Share-Based Compensation Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 24, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Preferred Stock, Shares Authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized    
Share Repurchase Program [Abstract]        
Stock Repurchase Program, Authorized Amount $ 145.0us-gaap_StockRepurchaseProgramAuthorizedAmount1      
Stock Repurchase Program, Remaining Authorized Repurchase Amount 30.7us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1      
Stock Repurchased During Period, Shares 1,700,000us-gaap_StockRepurchasedDuringPeriodShares      
Stock Repurchased During Period, Value 20.2us-gaap_StockRepurchasedDuringPeriodValue      
Share Repurchases Pending Cash Settlement 0.2mcrl_ShareRepurchasesPendingCashSettlement      
Incentive Award Plans [Abstract]        
Options exercisable and expected to vest 5,172,424us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber      
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 5 years 8 months 1 day      
Estimated intrinsic value of options exercisable and expected to vest 20.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue      
Weighted average fair values of options granted $ 2.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 2.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 2.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Aggregate intrinsic value of options exercised 4.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 1.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 1.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue  
Cash Received from Exercise of Stock Options 12.7us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 4.0us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 3.3us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions  
Excess tax benefit realized from exercise of non-qualified stock options and disqualifying dispositions of incentive stock options 2.0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 0.5us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 0.2us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions  
Share Price $ 14.51us-gaap_SharePrice      
Intrinsic value of outstanding options 22.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue      
Intrinsic value of exercisable options 14.1us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1      
Capitalized share-based compensation included in inventory 0.2mcrl_CapitalizedShareBasedCompensationIncludedInInventory 0.2mcrl_CapitalizedShareBasedCompensationIncludedInInventory    
Nonvested Awards, Compensation Not yet Recognized, Stock Options 4.8us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions      
Employee Stock Purchase Plan [Abstract]        
Stock issued during the period under the plan 100,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 100,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 100,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans  
Weighted average purchase price per share of shares purchased $ 11.43mcrl_EmployeeStockPurchasePlanWeightedAveragePurchasePriceOfSharesPurchased $ 9.32mcrl_EmployeeStockPurchasePlanWeightedAveragePurchasePriceOfSharesPurchased $ 9.40mcrl_EmployeeStockPurchasePlanWeightedAveragePurchasePriceOfSharesPurchased  
2012 Equity Incentive Award Plan [Member]        
Incentive Award Plans [Abstract]        
Reduction in shares available for issuance under the current plan for shares issued under the prior plan 2mcrl_ShareBasedCompensationArrangementByShareBasedPaymentAwardReductionInSharesAvailableForIssuanceUnderCurrentPlanForSharesIssuedUnderPriorPlanShares
/ us-gaap_PlanNameAxis
= mcrl_A2012EquityIncentiveAwardPlanMember
     
Number of shares reserved for future issuance       6,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= mcrl_A2012EquityIncentiveAwardPlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= mcrl_A2012EquityIncentiveAwardPlanMember
     
Employee Stock Purchase Plan [Member]        
Employee Stock Purchase Plan [Abstract]        
Discounted market value of stock, percent 95.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
     
Number of shares reserved for issuance under the plan 2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
     
Employee Stock Option [Member]        
Incentive Award Plans [Abstract]        
Compensation cost not yet recognized, period for recognition 2 years 5 months 10 days      
Employee Stock Option [Member] | 2012 Equity Incentive Award Plan [Member]        
Incentive Award Plans [Abstract]        
Term of stock option grant 10 years      
Restricted Stock Units (RSUs) [Member]        
Incentive Award Plans [Abstract]        
RSUs expected to vest 1,300,000mcrl_RSUsexpectedtovest
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
RSUs, Outstanding, Weighted Average Remaining Contractual Terms 2 years 8 months 1 day      
RSUs, Aggregate Intrinsic Value, Nonvested 19.2us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Aggregate intrinsic value of RSU's expected to vest 10.8us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Aggregate Intrinsic Value of Vested RSUs $ 4.0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Compensation cost not yet recognized, period for recognition 2 years 10 months 20 days      
Vesting in Four Equal Installments [Member] | Restricted Stock Units (RSUs) [Member]        
Incentive Award Plans [Abstract]        
Vesting percentage 83.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= mcrl_VestingInFourEqualInstallmentsMember
     
Vesting Period 4 years      
Vesting One-Third Annually Beginning Third Anniversary of Grant Date [Member] | Restricted Stock Units (RSUs) [Member]        
Incentive Award Plans [Abstract]        
Vesting percentage 14.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= mcrl_VestingOneThirdAnnuallyBeginningThirdAnniversaryOfGrantDateMember
     
Minimum [Member] | Annual Vesting Percentage [Member] | Employee Stock Option [Member] | 2012 Equity Incentive Award Plan [Member]        
Incentive Award Plans [Abstract]        
Vesting percentage 20.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= mcrl_A2012EquityIncentiveAwardPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VestingAxis
= mcrl_AnnualVestingPercentageMember
     
Maximum [Member] | Annual Vesting Percentage [Member] | Employee Stock Option [Member] | 2012 Equity Incentive Award Plan [Member]        
Incentive Award Plans [Abstract]        
Vesting percentage 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= mcrl_A2012EquityIncentiveAwardPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VestingAxis
= mcrl_AnnualVestingPercentageMember