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Note 8 - Shareholders' Equity - Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Apr. 01, 2017
Balance |  | $ 927,556 |
Net income |  | 36,029 | $ 38,891
Other comprehensive income |  | (279) |
Stock-based compensation |  | 8,714 |
Withheld shares on restricted share units for withholding taxes |  | (2,758) |
Stock options exercised |  | 9,609 |
Issuance of common stock(a) | [1] | 472,301 |
Cash dividends paid ($0.37 per share) |  | (9,198) |
Balance |  | 1,441,974 |
Parent [Member] |  |  |
Balance |  | 927,419 |
Net income |  | 36,029 |
Other comprehensive income |  | (279) |
Stock-based compensation |  | 8,714 |
Withheld shares on restricted share units for withholding taxes |  | (2,758) |
Stock options exercised |  | 9,609 |
Issuance of common stock(a) | [1] | 472,301 |
Cash dividends paid ($0.37 per share) |  | (9,198) |
Balance |  | 1,441,837 |
Noncontrolling Interest [Member] |  |  |
Balance |  | 137 |
Net income |  |  |
Other comprehensive income |  |  |
Stock-based compensation |  |  |
Withheld shares on restricted share units for withholding taxes |  |  |
Stock options exercised |  |  |
Issuance of common stock(a) | [1] |  |
Cash dividends paid ($0.37 per share) |  |  |
Balance |  | $ 137 |
[1] | The issuance of common stock (2,092,491 shares) during the three months ended March 31, 2018 relates to the acquisition of IXYS. See Note 2, Acquisitions for further discussion.

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