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Stock-Based Compensation (Nonvested Service Based Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) - $ / shares
3 Months Ended
Dec. 28, 2014
Mar. 29, 2015
Number of Shares Outstanding (in shares)    
Number of shares, nonvested at beginning of period (shares)   940,857
Number of shares, granted (shares)   263,810
Number of shares, vested (shares)   (230,334)
Number of shares, forfeited (shares)   (4,590)
Number of shares, nonvested at end of period (shares) 940,857 969,743
Number of shares, vested and expected to vest (shares)   856,572
Number of shares, vested at end of period (shares)   411,250
Weighted-average vest date    
Weighted-average vest date, nonvested at beginning in years 6 months 23 days 1 year 3 months 23 days
Weighted-Average vest date, vested and expected to vest in years   1 year 2 months 9 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)   13.25
Weighted-average gant date fair value, vested (USD per share)   13.69
Weighted-average grant date fair value, forfeited (USD per share)   14.21
Weighted-average grant date fair value, nonvested at end of period (USD per share) $ 17.11 $ 16.89