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EARNINGS PER SHARE | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
EARNINGS PER SHARE [Text Block] | 10. EARNINGS PER SHARE: Basic earnings per share are calculated by dividing net income by the weighted-average shares of common stock outstanding during the period. Diluted earnings per share are calculated by dividing net income by the weighted-average shares of common stock and dilutive common equivalent shares outstanding during the period. Dilutive common equivalent shares included in this calculation consist of dilutive shares issuable upon the assumed exercise of outstanding common stock options, the assumed vesting of outstanding restricted stock units, the assumed issuance of awards under the stock purchase plan and contingently issuable performance-based awards, as computed using the treasury stock method. A summary of the earnings per share calculation is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands, except per share amounts) |  | 2020 |  | 2019 |  | 2018
Basic earnings per share: |  | ​ |  |  | ​ |  |  | ​ |
Net income | ​ | $ | 71,176 | ​ | $ | 193,468 | ​ | $ | 69,984
Weighted-average common shares | ​ |  | 59,657 | ​ |  | 58,534 | ​ |  | 58,912
Basic earnings per share | ​ | $ | 1.19 | ​ | $ | 3.31 | ​ | $ | 1.19
Diluted earnings per share: (1) | ​ |  |  | ​ |  |  | ​ |  |
Net income | ​ | $ | 71,176 | ​ | $ | 193,468 | ​ | $ | 69,984
Weighted-average common shares | ​ |  | 59,657 | ​ |  | 58,534 | ​ |  | 58,912
Effect of dilutive awards: | ​ |  |  | ​ |  |  | ​ |  |
Employee stock plans | ​ |  | 1,188 | ​ |  | 1,098 | ​ |  | 1,382
Diluted weighted-average common shares | ​ |  | 60,845 | ​ |  | 59,632 | ​ |  | 60,294
Diluted earnings per share | ​ | $ | 1.17 | ​ | $ | 3.24 | ​ | $ | 1.16
(1) | The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has included in the 2020, 2019 and 2018 calculations those shares that were contingently issuable upon the satisfaction of the performance conditions as of the end of the respective periods.
In the years ended December 31, 2020, 2019, and 2018, no outstanding stock awards were determined to be anti-dilutive and therefore were excluded from the computation of diluted earnings per share. 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.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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