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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] | Retained Earnings [Member] Cumulative Effect Period Of Adoption Adjustment [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 |  |  | $ 692 | $ 2,188,777 | $ (462,557) | $ 9,531,433 |  | $ (3,397,548)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2018 |  |  |  |  |  |  |  |
Balance, shares at Dec. 31, 2018 |  | 40,651,148 |  |  |  |  |  |
Issued during the period, net, shares |  | 262,448 |  |  |  |  |  |
Treasury shares acquired, shares |  | (114,633) |  |  |  |  |  |
Issued during the period, net |  |  | 2 |  |  |  |  |
Share-based compensation plans |  |  |  | 30,883 |  |  |  |
Net increase (decrease) during the period | $ 490,709 |  |  |  | 490,709 |  |  |
Net income (loss) | 1,009,461 |  |  |  |  | 1,009,461 |  |
Dividends declared ($6.20 per share 2021, $6.20 per share 2020 and $5.75 per share 2019) | (234,322) |  |  |  |  | (234,322) |  |
Purchase of treasury shares |  |  |  |  |  |  |  | (24,604)
Balance at Dec. 31, 2019 | 9,132,925 |  | 694 | 2,219,660 | 28,152 | 10,306,571 |  | (3,422,152)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019 |  |  |  |  |  |  | (4,214) |
Balance, shares at Dec. 31, 2019 |  | 40,798,963 |  |  |  |  |  |
Issued during the period, net, shares |  | 155,410 |  |  |  |  |  |
Treasury shares acquired, shares |  | (970,892) |  |  |  |  |  |
Issued during the period, net |  |  | 2 |  |  |  |  |
Share-based compensation plans |  |  |  | 25,641 |  |  |  |
Net increase (decrease) during the period | 506,746 |  |  |  | 506,746 |  |  |
Net income (loss) | 514,151 |  |  |  |  | 514,151 |  |
Dividends declared ($6.20 per share 2021, $6.20 per share 2020 and $5.75 per share 2019) | (249,056) |  |  |  |  | (249,056) |  |
Purchase of treasury shares |  |  |  |  |  |  |  | (200,020)
Balance at Dec. 31, 2020 | $ 9,726,176 |  | 696 | 2,245,301 | 534,899 | 10,567,452 |  | (3,622,172)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2020 |  |  |  |  |  |  |  |
Balance, shares at Dec. 31, 2020 | 69,620,000 | 39,983,481 |  |  |  |  |  |
Issued during the period, net, shares |  | 170,774 |  |  |  |  |  |
Treasury shares acquired, shares |  | (887,622) |  |  |  |  |  |
Issued during the period, net |  |  | 2 |  |  |  |  |
Share-based compensation plans |  |  |  | 29,130 |  |  |  |
Net increase (decrease) during the period | $ (523,375) |  |  |  | (523,375) |  |  |
Net income (loss) | 1,379,083 |  |  |  |  | 1,379,083 |  |
Dividends declared ($6.20 per share 2021, $6.20 per share 2020 and $5.75 per share 2019) | (246,699) |  |  |  |  | (246,699) |  |
Purchase of treasury shares |  |  |  |  |  |  |  | (225,136)
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 |  |  |  |  |  |

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