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Shareholders' Equity - Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance |  |  | $ 927,556 |
Net income | $ 53,546 | $ 42,808 | 131,900 | $ 130,338
Other comprehensive loss | (7,947) | $ (239) | (24,168) | $ 1,236
Stock-based compensation |  |  | 23,153 |
Withheld shares on restricted share units for withholding taxes |  |  | (7,252) |
Stock options exercised |  |  | 25,171 |
Issuance of common stock |  |  | 472,301 |
Cash dividends paid |  |  | (29,258) |
Non-controlling interest |  |  | (7) |
Balance | 1,519,396 |  | 1,519,396 |
Littelfuse, Inc. Shareholders’ Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance |  |  | 927,419 |
Net income |  |  | 131,900 |
Other comprehensive loss |  |  | (24,168) |
Stock-based compensation |  |  | 23,153 |
Withheld shares on restricted share units for withholding taxes |  |  | (7,252) |
Stock options exercised |  |  | 25,171 |
Issuance of common stock |  |  | 472,301 |
Cash dividends paid |  |  | (29,258) |
Balance | 1,519,266 |  | 1,519,266 |
Non- controlling Interest |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance |  |  | 137 |
Non-controlling interest |  |  | (7) |
Balance | $ 130 |  | $ 130 |

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