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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Balances at Dec. 28, 2014 $ 107,616 $ 134 $ 205,749 $ (22) $ (98,245)
Balances (in shares) at Dec. 28, 2014   13,389,000      
Proceeds from issuance of stock on options exercised 168   168    
Proceeds from issuance of stock on options exercised (in shares)   25,000      
Effect of share-based compensation 809   809    
Other comprehensive income 22     $ 22  
Share issuance related to business combination 77,350 $ 85 77,265    
Share issuance related to business combination (in shares)   8,454,000      
Net income 24,520       24,520
Balances at Dec. 31, 2015 210,485 $ 219 283,991   (73,725)
Balances (in shares) at Dec. 31, 2015   21,868,000      
Proceeds from issuance of stock on options exercised 1,792 $ 3 1,789    
Proceeds from issuance of stock on options exercised (in shares)   314,000      
Effect of share-based compensation 3,878   3,878    
Share issuance related to business combination 500 $ 1 499    
Share issuance related to business combination (in shares)   50,000      
Special dividend ($1.71 per share) (23,529)       (23,529)
Net income 16,300       16,300
Balances at Dec. 31, 2016 209,426 $ 223 290,157   (80,954)
Balances (in shares) at Dec. 31, 2016   22,232,000      
Proceeds from issuance of stock on options exercised $ 169 $ 1 168    
Proceeds from issuance of stock on options exercised (in shares) 22,989 135,000      
Effect of share-based compensation $ 8,754   8,754    
Tax benefit from share-based compensation (1,015)   (1,015)    
Share issuance related to business combination 101,486 $ 40 101,446    
Share issuance related to business combination (in shares)   4,046,000      
Net income 2,171       2,171
Balances at Dec. 31, 2017 $ 320,991 $ 264 $ 399,510   $ (78,783)
Balances (in shares) at Dec. 31, 2017   26,413,000