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Share-based Compensation (Details 2) (Restricted Stock Units, USD $)
3 Months Ended
Mar. 31, 2015
Apr. 01, 2014
Share-based compensation    
Unrecognized compensation cost of unvested stock awards (in dollars) $ 19,900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Expected weighted-average period of recognition of unrecognized compensation cost of unvested awards 1 year 4 months 24 days  
Restricted Stock Units, Shares    
Outstanding at the beginning of the period (in shares) 978,124us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber  
Granted (in shares) 419,018us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod  
Forfeited (in shares) (12,327)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod  
Vested (in shares) (391,002)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod  
Outstanding at the end of period (in shares) 993,813us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber  
Restricted Stock Units, Weighted-Average Grant Date Fair Value    
Outstanding at the beginning of the period (in dollars per share) $ 22.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue  
Granted (in dollars per share) $ 35.51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Forfeited (in dollars per share) $ 24.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue  
Vested (in dollars per share) $ 18.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue  
Outstanding at the end of the period (in dollars per share) $ 29.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue  
Weighted-Average Remaining Contractual Term (years)    
Weighted-Average Remaining Contractual Term 1 year 4 months 28 days  
Aggregate Intrinsic Value    
Outstanding at the end of the period (in dollars) 36,223,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding  
Intrinsic value of awards vested (in dollars) $ 13,400,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested $ 11,500,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
Minimum
   
Share-based compensation    
Vesting period 1 year  
Maximum
   
Share-based compensation    
Vesting period 5 years