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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] | Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member] Cumulative Effect Period Of Adoption Adjustment [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect Period Of Adoption Adjustment [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  |  | $ 691 | $ 2,165,768 | $ (160,891) |  | $ 9,657,412 |  | $ (3,322,244)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |
Balance (Accounting Standards Update 2016-01 [Member]) at Dec. 31, 2017 |  |  |  |  |  | $ (1,201) |  | 1,201 |
Balance, shares at Dec. 31, 2017 |  | 40,835,272 |  |  |  |  |  |  |
Issued during the period, net, shares |  | 158,055 |  |  |  |  |  |  |
Treasury shares acquired, shares |  | (342,179) |  |  |  |  |  |  |
Issued during the period, net |  |  | 1 |  |  |  |  |  |
Share-based compensation plans |  |  |  | 23,009 |  |  |  |  |
Net increase (decrease) during the period | $ (300,465) |  |  |  | (300,465) |  |  |  |
Net income (loss) | 89,041 |  |  |  |  |  | 89,041 |  |
Dividends declared ($6.20 per share 2020,$5.75 per share 2019 and $5.30 per share in 2018) | (216,221) |  |  |  |  |  | (216,221) |  |
Purchase of treasury shares |  |  |  |  |  |  |  |  | (75,304)
Balance at Dec. 31, 2018 | 7,860,797 |  | 692 | 2,188,777 | (462,557) |  | 9,531,433 |  | (3,397,548)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2018 |  |  |  |  |  |  |  |  |
Balance (Accounting Standards Update 2016-01 [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 2020,$5.75 per share 2019 and $5.30 per share in 2018) | (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 (Accounting Standards Update 2016-01 [Member]) at Dec. 31, 2019 |  |  |  |  |  |  |  |  |
Balance, shares at Dec. 31, 2019 | 69,464,000 | 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 2020,$5.75 per share 2019 and $5.30 per share in 2018) | (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, shares at Dec. 31, 2020 | 69,620,000 | 39,983,481 |  |  |  |  |  |  |

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