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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]
--- | --- | --- | --- | --- | --- | --- | ---
Change to beginning balance due to adoption of Accounting Standards Update 2016-01 |  |  |  |  | $ (1,250) | $ 1,250 |
Balance at Dec. 31, 2016 |  |  | $ 689 | $ 2,140,783 | (216,764) | 9,380,653 | $ (3,272,244)
Balance, shares at Dec. 31, 2016 |  | 40,898,864 |  |  |  |  |
Issued during the period, net, shares |  | 172,901 |  |  |  |  |
Treasury shares acquired, shares |  | (236,493) |  |  |  |  |
Issued during the period, net |  |  | 2 |  |  |  |
Share-based compensation plans |  |  |  | 24,985 |  |  |
Net increase (decrease) during the period | $ 57,123 |  |  |  | 57,123 |  |
Net income (loss) | 482,751 |  |  |  |  | 482,751 |
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) | (207,242) |  |  |  |  | (207,242) |
Purchase of treasury shares |  |  |  |  |  |  | (50,000)
Balance at Dec. 31, 2017 | 8,340,736 |  | 691 | 2,165,768 | (160,891) | 9,657,412 | (3,322,244)
Balance, shares at Dec. 31, 2017 |  | 40,835,272 |  |  |  |  |
Change to beginning balance due to adoption of Accounting Standards Update 2016-01 |  |  |  |  | (1,201) | 1,201 |
Net income (loss) | 215,186 |  |  |  |  | 215,186 |
Balance at Mar. 31, 2018 | 8,320,552 |  |  |  |  | 9,820,559 |
Balance at Dec. 31, 2017 | 8,340,736 |  | 691 | 2,165,768 | (160,891) | 9,657,412 | (3,322,244)
Balance, shares at Dec. 31, 2017 |  | 40,835,272 |  |  |  |  |
Net income (loss) | 275,973 |  |  |  |  | 275,973 |
Balance at Jun. 30, 2018 | 8,208,613 |  |  |  |  | 9,828,106 |
Balance at Dec. 31, 2017 | 8,340,736 |  | 691 | 2,165,768 | (160,891) | 9,657,412 | (3,322,244)
Balance, shares at Dec. 31, 2017 |  | 40,835,272 |  |  |  |  |
Net income (loss) | 474,354 |  |  |  |  | 474,354 |
Balance at Sep. 30, 2018 | 8,289,045 |  |  |  |  | 9,973,624 |
Balance at Dec. 31, 2017 | 8,340,736 |  | 691 | 2,165,768 | (160,891) | 9,657,412 | (3,322,244)
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 ($1.40 per share in 2019 and $1.30 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, shares at Dec. 31, 2018 | 69,202,000 | 40,651,148 |  |  |  |  |
Balance at Mar. 31, 2018 | $ 8,320,552 |  |  |  |  | 9,820,559 |
Net income (loss) | 60,787 |  |  |  |  | 60,787 |
Balance at Jun. 30, 2018 | 8,208,613 |  |  |  |  | 9,828,106 |
Net income (loss) | 198,381 |  |  |  |  | 198,381 |
Balance at Sep. 30, 2018 | 8,289,045 |  |  |  |  | 9,973,624 |
Net income (loss) | (385,313) |  |  |  |  |  |
Balance at Dec. 31, 2018 | $ 7,860,797 |  | 692 | 2,188,777 | (462,557) | 9,531,433 | (3,397,548)
Balance, shares at Dec. 31, 2018 | 69,202,000 | 40,651,148 |  |  |  |  |
Change to beginning balance due to adoption of Accounting Standards Update 2016-01 |  |  |  |  |  |  |
Net income (loss) | $ 354,551 |  |  |  |  | 354,551 |
Balance at Mar. 31, 2019 | 8,389,273 |  |  |  |  | 9,828,847 |
Balance at Dec. 31, 2018 | $ 7,860,797 |  | 692 | 2,188,777 | (462,557) | 9,531,433 | (3,397,548)
Balance, shares at Dec. 31, 2018 | 69,202,000 | 40,651,148 |  |  |  |  |
Net income (loss) | $ 687,419 |  |  |  |  |  |
Balance at Jun. 30, 2019 | 8,836,817 |  |  |  |  | 10,104,716 |
Balance at Dec. 31, 2018 | $ 7,860,797 |  | 692 | 2,188,777 | (462,557) | 9,531,433 | (3,397,548)
Balance, shares at Dec. 31, 2018 | 69,202,000 | 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 ($1.40 per share in 2019 and $1.30 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, shares at Dec. 31, 2019 | 69,464,000 | 40,798,963 |  |  |  |  |
Balance at Mar. 31, 2019 | $ 8,389,273 |  |  |  |  | 9,828,847 |
Net income (loss) | 332,868 |  |  |  |  | 332,868 |
Balance at Jun. 30, 2019 | $ 8,836,817 |  |  |  |  | $ 10,104,716 |

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