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Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock Outstanding [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member] | Retained Earnings [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2020 |  |  | $ 696 | $ 2,245,301 | $ 534,899 | $ 10,567,452 | $ (3,622,172)
Balance, shares at Dec. 31, 2020 |  | 39,983,481 |  |  |  |  |
Issued (redeemed) during the period, net, shares |  | 197,421 |  |  |  |  |
Treasury shares acquired, shares |  | (165,562) |  |  |  |  |
Issued during the period, net |  |  | 2 |  |  |  |
Share-based compensation plans |  |  |  | 11,089 |  |  |
Net increase (decrease) during the period | $ (177,721) |  |  |  | (177,721) |  |
Net income (loss) | 1,021,844 |  |  |  |  | 1,021,844 |
Dividends declared ($1.65 per share in 2Q 2022 and $3.20 per share YTD in 2022; $1.55 per share in 2Q 2021 and $3.10 per share YTD in 2021) | (124,274) |  |  |  |  | (124,274) |
Purchase of treasury shares |  |  |  |  |  |  | (40,327)
Balance at Jun. 30, 2021 | 10,416,789 |  | 698 | 2,256,390 | 357,178 | 11,465,022 | (3,662,499)
Balance, shares at Jun. 30, 2021 |  | 40,015,340 |  |  |  |  |
Balance at Mar. 31, 2021 |  |  | 698 | 2,245,737 | 235,079 | 10,847,086 | (3,645,717)
Balance, shares at Mar. 31, 2021 |  | 40,082,500 |  |  |  |  |
Issued (redeemed) during the period, net, shares |  | 940 |  |  |  |  |
Treasury shares acquired, shares |  | (68,100) |  |  |  |  |
Issued during the period, net |  |  |  |  |  |  |
Share-based compensation plans |  |  |  | 10,653 |  |  |
Net increase (decrease) during the period | 122,099 |  |  |  | 122,099 |  |
Net income (loss) | 679,982 |  |  |  |  | 679,982 |
Dividends declared ($1.65 per share in 2Q 2022 and $3.20 per share YTD in 2022; $1.55 per share in 2Q 2021 and $3.10 per share YTD in 2021) | (62,045) |  |  |  |  | (62,046) |
Purchase of treasury shares |  |  |  |  |  |  | (16,782)
Balance at Jun. 30, 2021 | 10,416,789 |  | 698 | 2,256,390 | 357,178 | 11,465,022 | (3,662,499)
Balance, shares at Jun. 30, 2021 |  | 40,015,340 |  |  |  |  |
Balance at Dec. 31, 2021 | $ 10,139,180 |  | 698 | 2,274,431 | 11,523 | 11,699,836 | (3,847,308)
Balance, shares at Dec. 31, 2021 | 69,790,000 | 39,266,633 |  |  |  |  |
Issued (redeemed) during the period, net, shares |  | 156,121 |  |  |  |  |
Treasury shares acquired, shares |  | (5,000) |  |  |  |  |
Issued during the period, net |  |  | 2 |  |  |  |
Share-based compensation plans |  |  |  | 9,082 |  |  |
Net increase (decrease) during the period | $ (1,588,377) |  |  |  | (1,588,377) |  |
Net income (loss) | 420,381 |  |  |  |  | 420,381 |
Dividends declared ($1.65 per share in 2Q 2022 and $3.20 per share YTD in 2022; $1.55 per share in 2Q 2021 and $3.10 per share YTD in 2021) | (126,079) |  |  |  |  | (126,079) |
Purchase of treasury shares |  |  |  |  |  |  | (1,322)
Balance at Jun. 30, 2022 | $ 8,852,866 |  | 700 | 2,283,513 | (1,576,854) | 11,994,137 | (3,848,630)
Balance, shares at Jun. 30, 2022 | 69,947,000 | 39,417,754 |  |  |  |  |
Balance at Mar. 31, 2022 |  |  | 700 | 2,271,890 | (832,820) | 11,936,489 | (3,848,630)
Balance, shares at Mar. 31, 2022 |  | 39,448,677 |  |  |  |  |
Issued (redeemed) during the period, net, shares |  | (30,923) |  |  |  |  |
Treasury shares acquired, shares |  | 0 |  |  |  |  |
Issued during the period, net |  |  |  |  |  |  |
Share-based compensation plans |  |  |  | 11,623 |  |  |
Net increase (decrease) during the period | $ (744,034) |  |  |  | (744,034) |  |
Net income (loss) | 122,630 |  |  |  |  | 122,630 |
Dividends declared ($1.65 per share in 2Q 2022 and $3.20 per share YTD in 2022; $1.55 per share in 2Q 2021 and $3.10 per share YTD in 2021) | (64,982) |  |  |  |  | (64,982) |
Purchase of treasury shares |  |  |  |  |  |  |
Balance at Jun. 30, 2022 | $ 8,852,866 |  | $ 700 | $ 2,283,513 | $ (1,576,854) | $ 11,994,137 | $ (3,848,630)
Balance, shares at Jun. 30, 2022 | 69,947,000 | 39,417,754 |  |  |  |  |

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