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Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Earnings Per Share [Abstract] |  |  |  |
Net earnings | $ 200,300 | $ 206,006 | $ 501,345 | $ 509,796
Basic earnings (loss) per common share: |  |  |  |
Net earnings (in dollars per basic share) | $ 1.39 | $ 1.42 | $ 3.48 | $ 3.51
Weighted average shares outstanding - basic (in shares) | 144,032,000 | 145,372,000 | 144,082,000 | 145,276,000
Diluted earnings (loss) per common share: |  |  |  |
Net earnings (in dollars per diluted share) | $ 1.38 | $ 1.40 | $ 3.45 | $ 3.47
Weighted average shares outstanding - diluted (in shares) | 145,289,000 | 147,051,000 | 145,313,000 | 147,053,000
Reconciliation Of Share Amounts Used In Computing Earnings Per Share [Abstract] |  |  |  |
Weighted average shares outstanding - basic (in shares) | 144,032,000 | 145,372,000 | 144,082,000 | 145,276,000
Dilutive effect of assumed exercise of SAR's and vesting of performance shares (in shares) | 1,257,000 | 1,679,000 | 1,231,000 | 1,777,000
Weighted average shares outstanding - diluted (in shares) | 145,289,000 | 147,051,000 | 145,313,000 | 147,053,000
Antidilutive securities excluded from computation of earnings per share | 36,000 | 28,000 | 95,000 | 9,000

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