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Shareholders' Equity Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Employee Stock Option [Member]      
Stock options activity [Roll Forward]      
Balance at January 2, 2016 1,388,000    
Granted 299,000    
Exercised (188,000)    
Canceled/Forfeited (145,000)    
Outstanding at December 31, 2016 1,354,000 1,388,000  
Exercisable at December 31, 2016 927,000    
Vested and expected to vest at December 31, 2016 1,315,000    
Weighted- Average Exercise Price per Share      
Balance at January 2, 2016 $ 18.44    
Granted 19.19    
Exercised 12.21    
Canceled/Forfeited 25.71    
Outstanding at December 31, 2016 18.70 $ 18.44  
Exercisable at December 31, 2016 17.40    
Vested and expected to vest at December 31, 2016 $ 18.61    
Weighted- Average Remaining Contractual Term      
Weighted-average remaining contractual term (years) - outstanding 5 years 10 months 24 days 5 years 3 months 18 days  
Weighted-average remaining contractual terms (years) - exercisable 4 years 7 months 6 days    
Weighted-average remaining contractual term (years) - vested and expected to vest 5 years 10 months 24 days    
Aggregate Intrinsic Value      
Aggregate intrinsic value - outstanding [1] $ 7,541 $ 7,366  
Aggregate intrinsic value - exercisable [1] 6,264    
Aggregate intrinsic value - vested and expected to vest [1] $ 7,442    
Other information - options [Abstract]      
Weighted-average grant date fair value of stock options granted $ 8.85 $ 15.94 $ 9.33
Total intrinsic value (at exercise) of stock options exercised $ 2,088 $ 4,592 $ 2,478
Proceeds from stock options exercised 2,300    
Tax benefit, exercise of stock options 800    
Stock-based compensation expense related to non-vested awards $ 2,600    
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) 50.00% 54.00% 58.00%
Risk-free interest rate (in hundredths) 1.40% 1.60% 1.80%
Expected term (in years) 5 years 2 months 12 days 5 years 2 months 12 days 5 years 3 months 18 days
MarketBasedEmployeeStockOption [Member]      
Stock options activity [Roll Forward]      
Granted 30,500    
Weighted- Average Exercise Price per Share      
Granted $ 10.25    
Stock Option Valuation Assumptions [Abstract]      
Fair value assumptions, method used Monte Carlo simulation model    
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.