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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 | 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
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Adjustments for the adoption of ASC 2014-09 and ASU No. 2016-16 | ASU No. 2014-09 [Member] | 119 |  |  | 119 |  |  |
Adjustments for the adoption of ASC 2014-09 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 | 23,499 |  |  | 23,207 |  |  | 292
Dividends declared | (4,882) |  |  | (4,882) |  |  |
Activity under stock plans (in shares) |  |  |  |  | (85,288) |  |
Activity under stock plans | 711 |  | (1,379) |  | $ 2,090 |  |
Other comprehensive items | (10,191) |  |  |  |  | (10,138) | (53)
Ending balance (in shares) at Jun. 30, 2018 |  | 14,624,159 |  |  | 3,528,550 |  |
Ending balance at Jun. 30, 2018 | $ 341,685 | $ 146 | $ 101,842 | $ 361,262 | $ (86,464) | $ (36,853) | $ 1,752

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