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Stock-Based Compensation (Nonvested Service Based Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) - $ / shares
6 Months Ended 12 Months Ended
Jun. 28, 2015
Dec. 28, 2014
Number of Shares Outstanding (in shares)    
Number of shares, nonvested at beginning of period (shares) 940,857  
Number of shares, granted (shares) 331,000  
Number of shares, vested (shares) (290,938)  
Number of shares, forfeited (shares) (33,644)  
Number of shares, nonvested at end of period (shares) 947,275 940,857
Number of shares, vested and expected to vest (shares) 850,831  
Number of shares, vested at end of period (shares) 424,375  
Weighted-average vest date    
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageVestDate 1 year 2 months 24 days 6 months 23 days
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageVestDate 1 year 2 months 24 days 6 months 23 days
Weighted-Average vest date, vested and expected to vest in years 1 year 1 month 25 days  
Weighted-average grant date fair value (in US$ per share)    
Weighted-average grant date fair value, nonvested at beginning of period (USD per share) $ 17.11  
Weighted-average grant date fair value, granted (USD per share) 12.61  
Weighted-average grant date fair value, vested (USD per share) 12.93  
Weighted-average grant date fair value, forfeited (USD per share) 14.73  
Weighted-average grant date fair value, nonvested at end of period (USD per share) $ 16.91 $ 17.11