| Net Income Per Share The calculation of net income per share for the three and nine months ended September 30, 2022 and 2021, is reflected in the following table (in thousands, except per share amounts): | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended
September 30, | | Nine Months Ended
September 30, | | | 2022 | | 2021 | | 2022 | | 2021 | | Net income | $ | 166,206 | | | $ | 170,871 | | | $ | 510,266 | | | $ | 430,682 | | | Basic: | | | | | | | | Weighted average shares | 107,855 | | | 110,176 | | | 108,630 | | | 110,816 | | | Diluted: | | | | | | | | Weighted average shares | 107,855 | | | 110,176 | | | 108,630 | | | 110,816 | | | Dilutive effect of potential common shares | 763 | | | 1,314 | | | 1,000 | | | 1,138 | | | Diluted weighted average shares | 108,618 | | | 111,490 | | | 109,630 | | | 111,954 | | | Net income per share: | | | | | | | | | Basic | $ | 1.54 | | | $ | 1.55 | | | $ | 4.70 | | | $ | 3.89 | | | Diluted | $ | 1.53 | | | $ | 1.53 | | | $ | 4.65 | | | $ | 3.85 | |
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