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Shareholders' Equity Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Employee Stock Option [Member]      
Stock options activity [Roll Forward]      
Balance at December 31, 2016 1,354,000    
Granted 262,000    
Exercised (222,000)    
Canceled/Forfeited (39,000)    
Outstanding at December 30, 2017 1,355,000 1,354,000  
Exercisable at December 30, 2017 879,000    
Vested and expected to vest at December 30, 2017 1,321,000    
Weighted- Average Exercise Price per Share      
Balance at December 31, 2016 $ 18.70    
Granted 24.26    
Exercised 14.58    
Canceled/Forfeited 26.17    
Outstanding at December 30, 2017 20.23 $ 18.70  
Exercisable at December 30, 2017 18.79    
Vested and expected to vest at December 30, 2017 $ 20.16    
Weighted- Average Remaining Contractual Term      
Weighted-average remaining contractual term (years) - outstanding 6 years 2 months 12 days 5 years 10 months 24 days  
Weighted-average remaining contractual terms (years) - exercisable 4 years 9 months 18 days    
Weighted-average remaining contractual term (years) - vested and expected to vest 6 years 1 month 6 days    
Aggregate Intrinsic Value      
Aggregate intrinsic value - outstanding [1] $ 23,515 $ 7,541  
Aggregate intrinsic value - exercisable [1] 16,533    
Aggregate intrinsic value - vested and expected to vest [1] $ 23,023    
Other information - options [Abstract]      
Weighted-average grant date fair value of stock options granted $ 10.33 $ 8.85 $ 15.94
Total intrinsic value (at exercise) of stock options exercised $ 3,586 $ 2,088 $ 4,592
Proceeds from stock options exercised 3,200    
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options 1,300    
Stock-based compensation expense related to non-vested awards $ 2,800    
Weighted average period to recognize remaining expense over 1 year 9 months 18 days    
Stock Option Valuation Assumptions [Abstract]      
Fair value assumptions, method used Black-Scholes-Merton option-pricing model    
Expected dividend yield (in hundredths) 0.00% 0.00% 0.00%
Expected volatility (in hundredths) 46.00% 50.00% 54.00%
Risk-free interest rate (in hundredths) 2.00% 1.40% 1.60%
Expected term (in years) 5 years 1 month 6 days 5 years 2 months 12 days 5 years 2 months 12 days
Market-Based Stock Option [Member]      
Stock options activity [Roll Forward]      
Granted   30,500  
Weighted- Average Exercise Price per Share      
Granted   $ 10.25  
Stock Option Valuation Assumptions [Abstract]      
Expected dividend yield (in hundredths)   0.00%  
Expected volatility (in hundredths)   50.00%  
Risk-free interest rate (in hundredths)   1.80%  
[1] Aggregate intrinsic value includes only those options where the current share price is equal to or greater than the share price on the date of grant.