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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 | 30,675 |  |  | 30,332 |  |  | 343
Dividends declared | (6,933) |  |  | (6,933) |  |  |
Dividend paid to noncontrolling interest | (882) |  |  |  |  |  | (882)
Activity under stock plans (in shares) |  |  |  |  | (69,694) |  |
Activity under stock plans | 2,077 |  | 369 |  | $ 1,708 |  |
Other comprehensive items | 21,671 |  |  |  |  | 21,440 | 231
Ending balance (in shares) at Sep. 30, 2017 |  | 14,624,159 |  |  | 3,616,838 |  |
Ending balance at Sep. 30, 2017 | 330,887 | $ 146 | 101,774 | 344,449 | $ (88,627) | (28,197) | 1,342
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 | 42,478 |  |  | 41,991 |  |  | 487
Dividends declared | (7,326) |  |  | (7,326) |  |  |
Dividend paid to noncontrolling interest | (465) |  |  |  |  |  | (465)
Activity under stock plans (in shares) |  |  |  |  | (96,975) |  |
Activity under stock plans | 2,273 |  | (104) |  | $ 2,377 |  |
Other comprehensive items | (11,069) |  |  |  |  | (11,012) | (57)
Ending balance (in shares) at Sep. 29, 2018 |  | 14,624,159 |  |  | 3,516,863 |  |
Ending balance at Sep. 29, 2018 | $ 358,439 | $ 146 | $ 103,117 | $ 377,602 | $ (86,177) | $ (37,727) | $ 1,478

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