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Stock Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 08, 2012
Mar. 31, 2013
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for future issuance     2,229,558    
Performance based stock option grant, Exercise price $ 4.00        
Fair value $ 1.31        
Long term cash rate     30.00%    
Performance based stock option grant   2,916,563      
Share based compensation     $ 10,316 $ 8,765 $ 10,361
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance based stock option grant     674,592    
Share based compensation     $ 7,800 7,600 6,800
Restricted stock units, vesting schedules options one     4 years    
Percentage of vesting on restricted stock, option one, Second anniversary     50.00%    
Percentage of vesting on restricted stock, option one, Third anniversary     25.00%    
Percentage of vesting on restricted stock, option one, Fourth anniversary     25.00%    
Restricted stock units, vesting schedules options two     4 years    
Percentage of vesting on restricted stock, option two, First anniversary     25.00%    
Percentage of vesting on restricted stock, option two, Second anniversary     25.00%    
Percentage of vesting on restricted stock, option two, Third anniversary     25.00%    
Percentage of vesting on restricted stock, option two, Fourth anniversary     25.00%    
Restricted stock units, vesting schedules options three     3 years    
Percentage of vesting on restricted stock, option three, First anniversary     33.00%    
Percentage of vesting on restricted stock, option three, Second anniversary     33.00%    
Percentage of vesting on restricted stock, option three, Third anniversary     33.00%    
Compensation expense related to nonvested restricted stock unit based awards     $ 9,100    
Weighted average period, Restricted stock units     1 year 10 months 24 days    
Common Stock Subject to Vesting Requirements [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options vesting period     4 years    
Performance based stock option grant     182,279    
Share based compensation     $ 2,500 $ 1,200 900
Compensation expense related to common stock subject to vesting requirements     $ 4,200    
Weighted average period, Common stock     2 years 8 months 12 days    
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance based stock option grant 2,916,563        
Existing restricted stock unit Exchange Percentage 50.00%        
Growth of Pro-forma EPS Percentage 50.00%        
Growth of Pro-forma EBITDA percentage 50.00%        
Performance based stock option vesting term     6 years    
Trailing period     12 months    
Percentage of outstanding option on performance based     100.00%    
Share based compensation         2,700
Performance Shares [Member] | Chief Executive Officer [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance based stock option grant 1,912,500        
Performance Shares [Member] | Chief Operating Officer [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance based stock option grant 1,004,063        
Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares exercised     0    
Minimum [Member] | Stock Appreciation Rights (SARs) And Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options vesting period     4 years    
Maximum [Member] | Stock Appreciation Rights (SARs) And Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options vesting period     10 years    
Jibe Consulting Inc and Technolab International Corporation [Member] | Common Stock Subject to Vesting Requirements [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options vesting period     4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid     $ 3,600   $ 4,600