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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 Jan. 02, 2016   14,624,159     3,850,779    
Beginning balance at Jan. 02, 2016 $ 267,945 $ 146 $ 100,536 $ 297,258 $ (94,359) $ (36,972) $ 1,336
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 15,430     15,187     243
Dividends declared (4,133)     (4,133)      
Activity under stock plans (in shares)         (123,872)    
Activity under stock plans 1,544   (1,491)   $ 3,035    
Other comprehensive items 425         402 23
Ending balance (in shares) at Jul. 02, 2016   14,624,159     3,726,907    
Ending balance at Jul. 02, 2016 281,211 $ 146 99,045 308,312 $ (91,324) (36,570) 1,602
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 17,265     17,047     218
Dividends declared (4,621)     (4,621)      
Activity under stock plans (in shares)         (66,694)    
Activity under stock plans 530   (1,104)   $ 1,634    
Other comprehensive items 13,884         13,721 163
Ending balance (in shares) at Jul. 01, 2017   14,624,159     3,619,838    
Ending balance at Jul. 01, 2017 $ 311,337 $ 146 $ 100,301 $ 333,476 $ (88,701) $ (35,916) $ 2,031