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Earnings per Share | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Earnings per Share | Earnings per Share The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share amounts):
| 2021 |  | 2020 |  | 2019
Net earnings available to common shareholders | $ | 439,866 |  |  | $ | 330,456 |  |  | $ | 343,853 |
Weighted average shares outstanding for basic earnings per share | 169,635 |  |  | 167,462 |  |  | 166,515 |
Dilutive effect of stock options computed based on the treasury stock method using the average market price | 4,891 |  |  | 4,546 |  |  | 5,109 |
Weighted average shares outstanding for diluted earnings per share | 174,526 |  |  | 172,008 |  |  | 171,624 |
Basic earnings per share | $ | 2.59 |  |  | $ | 1.97 |  |  | $ | 2.06 |
Diluted earnings per share | $ | 2.52 |  |  | $ | 1.92 |  |  | $ | 2.00 |
Anti-dilutive stock options excluded from computations of diluted earnings per share totaled 0.4 million shares in 2021 and 0.3 million shares in both 2020 and 2019.

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