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SELECTED QUARTERLY INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended
​ | (unaudited)
​ | Dec. 31, | ​ | Sept. 30, | ​ | June 30, | ​ | Mar. 31, | ​ | Dec. 31, | ​ | Sept. 30, | ​ | June 30, | ​ | Mar. 31,
(In thousands, except per share data) | 2020 |  | 2020 |  | 2020 |  | 2020 |  | 2019(1) |  | 2019 |  | ​ | 2019 |  | 2019
Net revenues | $ | 150,693 | ​ | $ | 121,129 | ​ | $ | 106,832 | ​ | $ | 109,664 | ​ | $ | 114,457 | ​ | $ | 114,159 | ​ | $ | 102,865 | ​ | $ | 89,188
Gross profit |  | 74,005 | ​ |  | 59,569 | ​ |  | 53,536 | ​ |  | 56,480 | ​ |  | 58,225 | ​ |  | 58,131 | ​ |  | 51,572 | ​ |  | 45,474
Net income | $ | 27,278 | ​ | $ | 14,820 | ​ | $ | 13,192 | ​ | $ | 15,886 | ​ | $ | 158,291 | ​ | $ | 17,099 | ​ | $ | 10,845 | ​ | $ | 7,233
Earnings per share (2) |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Basic | $ | 0.46 | ​ | $ | 0.25 | ​ | $ | 0.22 | ​ | $ | 0.27 | ​ | $ | 2.69 | ​ | $ | 0.29 | ​ | $ | 0.19 | ​ | $ | 0.13
Diluted | $ | 0.45 | ​ | $ | 0.24 | ​ | $ | 0.22 | ​ | $ | 0.27 | ​ | $ | 2.64 | ​ | $ | 0.29 | ​ | $ | 0.19 | ​ | $ | 0.13
Shares used in per share calculation (2) |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Basic |  | 59,879 | ​ |  | 59,823 | ​ |  | 59,712 | ​ |  | 59,204 | ​ |  | 58,854 | ​ |  | 58,770 | ​ |  | 58,594 | ​ |  | 57,902
Diluted |  | 61,176 | ​ |  | 60,852 | ​ |  | 60,624 | ​ |  | 60,268 | ​ |  | 60,010 | ​ |  | 59,732 | ​ |  | 59,404 | ​ |  | 58,892
(1) | In October 2019, the Company entered into a favorable litigation settlement with ON Semiconductor Corporation which resulted in a $169.0 million net gain.
(2) | In July 2020, the Company’s board of directors approved a two-for-one stock split in the form of a stock dividend, payable on August 18, 2020, to stockholders of record as of the close of business on August 14, 2020. The Company’s stockholders received one additional share of common stock for each share of common stock held on August 14, 2020. The share and per share information for all periods presented in this Form 10-K has been adjusted for the effect of the stock split (Refer to Note 10, Earnings Per Share, in this Form 10-K for details).

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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