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Condensed Consolidated Statement of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Capital in Excess of Par Value [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Items [Member]
Noncontrolling Interest [Member]
Beginning balance (in shares) at Dec. 31, 2016   14,624,159     3,686,532    
Beginning balance at Dec. 31, 2016 $ 284,279 $ 146 $ 101,405 $ 321,050 $ (90,335) $ (49,637) $ 1,650
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 9,067     8,951     116
Dividend declared (2,310)     (2,310)      
Activity under stock plans (in shares)         (63,020)    
Activity under stock plans (887)   (2,431)   $ 1,544    
Other comprehensive items 5,141         5,095 46
Ending balance (in shares) at Apr. 01, 2017   14,624,159     3,623,512    
Ending balance at Apr. 01, 2017 295,290 $ 146 98,974 327,691 $ (88,791) (44,542) 1,812
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adjustments for the adoption of ASC 606 and ASU No. 2016-16 | ASU No. 2014-09 [Member] 119     119      
Adjustments for the adoption of ASC 606 and ASU No. 2016-16 | ASU No. 2016-16 [Member] (75)     (75)      
Beginning balance (in shares) at Dec. 30, 2017   14,624,159     3,613,838    
Beginning balance at Dec. 30, 2017 332,504 $ 146 103,221 342,893 $ (88,554) (26,715) 1,513
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 11,008     10,858     150
Dividend declared (2,440)     (2,440)      
Activity under stock plans (in shares)         (79,888)    
Activity under stock plans (1,435)   (3,393)   $ 1,958    
Other comprehensive items 5,546         5,503 43
Ending balance (in shares) at Mar. 31, 2018   14,624,159     3,533,950    
Ending balance at Mar. 31, 2018 $ 345,227 $ 146 $ 99,828 $ 351,355 $ (86,596) $ (21,212) $ 1,706