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Calculation Of Net Income Per Share (Tables)
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares [Table Text Block]
The following table presents the computation of weighted-average shares used in the calculation of basic and diluted earnings per share:
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
 (In thousands)
Weighted-average shares of common stock outstanding112,387115,347112,757115,861
Weighted-average potential shares of common stock outstanding:
Unvested RSUs and ESPP130197148276
Shares used to compute diluted earnings per share112,517115,544112,905116,137