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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    
Unrealized Gain (Loss), Net of Tax, at December 31, 2016 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 6,991     6,876     115
Dividend declared (2,063)     (2,063)      
Activity under stock plans (in shares)         (80,942)    
Activity under stock plans (656)   (2,639)   $ 1,983    
Other comprehensive items 5,386         5,327 59
Ending balance (in shares) at Apr. 02, 2016   14,624,159     3,769,837    
Unrealized Gain (Loss), Net of Tax, at April 1, 2017 at Apr. 02, 2016 277,603 $ 146 97,897 302,071 $ (92,376) (31,645) 1,510
Beginning balance (in shares) at Dec. 31, 2016   14,624,159     3,686,532    
Unrealized Gain (Loss), Net of Tax, at December 31, 2016 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    
Unrealized Gain (Loss), Net of Tax, at April 1, 2017 at Apr. 01, 2017 $ 295,290 $ 146 $ 98,974 $ 327,691 $ (88,791) $ (44,542) $ 1,812