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Stock-Based Compensation - Restricted Stock Units and Market-Based Restricted Stock Units (Details) (Restricted Stock Units (RSUs) [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 27, 2014
Restricted Stock Units (RSUs) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]  
Units outstanding at the beginning of the period (shares) 389
Units outstanding at the beginning of the period (weighted average grant date fair value per share) $ 7.67
Units granted during the period (shares) 951
Units granted during the period (weighted average grant date fair value per share) $ 14.69
Vested (shares) (11)
Vested (weighted averaged grant date fair value) $ 7.67
Forfeitures (shares) (30)
Forfeitures (weighted average grant date fair value) $ 10.21
Units outstanding at the end of the period (shares) 1,299
Units outstanding at the end of the period (weighted average grant date fair value per share) $ 12.75