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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 | $ 1,201 |  |  |  | $ (1,201) | $ 1,201 |
Balance, beginning of period at Dec. 31, 2017 |  |  | $ 691 | $ 2,165,768 | (160,891) | 9,685,908 | $ (3,322,244)
Balance, beginning of period, shares at Dec. 31, 2017 |  | 40,835,272 |  |  |  |  |
Issued during the period, net, shares |  | 143,362 |  |  |  |  |
Treasury shares acquired, shares |  | 0 |  |  |  |  |
Issued during the period, net |  |  | 1 |  |  |  |
Share-based compensation plans |  |  |  | (2,249) |  |  |
Net increase (decrease) during the period |  |  |  |  | (179,882) |  |
Net income (loss) |  |  |  |  |  | 210,318 |
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) |  |  |  |  |  | (53,240) |
Purchase of treasury shares |  |  |  |  |  |  | 0
Balance, end of period at Mar. 31, 2018 |  |  | 692 | 2,163,519 | (341,974) | 9,844,187 | (3,322,244)
Balance, end of period, shares at Mar. 31, 2018 |  | 40,978,634 |  |  |  |  |
Balance, beginning of period at Dec. 31, 2017 |  |  | 691 | 2,165,768 | (160,891) | 9,685,908 | (3,322,244)
Balance, beginning of period, shares at Dec. 31, 2017 |  | 40,835,272 |  |  |  |  |
Net increase (decrease) during the period | (283,246) |  |  |  |  |  |
Net income (loss) | 280,213 |  |  |  |  |  |
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) | (106,480) |  |  |  |  |  |
Balance, end of period at Jun. 30, 2018 | 8,241,349 |  | 692 | 2,172,701 | (445,338) | 9,860,842 | (3,347,548)
Balance, end of period, shares at Jun. 30, 2018 |  | 40,860,169 |  |  |  |  |
Balance, beginning of period at Mar. 31, 2018 |  |  | 692 | 2,163,519 | (341,974) | 9,844,187 | (3,322,244)
Balance, beginning of period, shares at Mar. 31, 2018 |  | 40,978,634 |  |  |  |  |
Issued during the period, net, shares |  | (5,718) |  |  |  |  |
Treasury shares acquired, shares |  | (112,747) |  |  |  |  |
Issued during the period, net |  |  | 0 |  |  |  |
Share-based compensation plans |  |  |  | 9,182 |  |  |
Net increase (decrease) during the period | (103,364) |  |  |  | (103,364) |  |
Net income (loss) | 69,895 |  |  |  |  | 69,895 |
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) | (53,240) |  |  |  |  | (53,240) |
Purchase of treasury shares |  |  |  |  |  |  | (25,304)
Balance, end of period at Jun. 30, 2018 | 8,241,349 |  | 692 | 2,172,701 | (445,338) | 9,860,842 | (3,347,548)
Balance, end of period, shares at Jun. 30, 2018 |  | 40,860,169 |  |  |  |  |
Change to beginning balance due to adoption of Accounting Standards Update 2016-01 |  |  |  |  | 0 | 0 |
Balance, beginning of period at Dec. 31, 2018 | $ 7,903,804 | $ 692 |  | 2,188,777 |  | 9,574,440 | (3,397,548)
Balance, beginning of period, shares at Dec. 31, 2018 | 69,202,000 | 40,651,148 |  |  |  |  |
Issued during the period, net, shares |  | 194,584 |  |  |  |  |
Treasury shares acquired, shares |  | (75,193) |  |  |  |  |
Issued during the period, net |  | $ 2 |  |  |  |  |
Share-based compensation plans |  |  |  | 767 |  |  |
Net increase (decrease) during the period |  |  |  |  | 246,446 |  |
Net income (loss) |  |  |  |  |  | 348,900 |
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) |  |  |  |  |  | (57,137) |
Purchase of treasury shares |  |  |  |  |  |  | (16,153)
Balance, end of period at Mar. 31, 2019 |  | $ 694 |  | 2,189,544 | (216,111) | 9,866,203 | (3,413,701)
Balance, end of period, shares at Mar. 31, 2019 |  | 40,770,539 |  |  |  |  |
Balance, beginning of period at Dec. 31, 2018 | $ 7,903,804 | $ 692 |  | 2,188,777 |  | 9,574,440 | (3,397,548)
Balance, beginning of period, shares at Dec. 31, 2018 | 69,202,000 | 40,651,148 |  |  |  |  |
Net increase (decrease) during the period | $ 417,655 |  |  |  |  |  |
Net income (loss) | 691,755 |  |  |  |  |  |
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) | (114,136) |  |  |  |  |  |
Balance, end of period at Jun. 30, 2019 | $ 8,884,160 | $ 694 |  | 2,198,461 | (44,902) | 10,152,059 | (3,422,152)
Balance, end of period, shares at Jun. 30, 2019 | 69,406,000 | 40,740,502 |  |  |  |  |
Balance, beginning of period at Mar. 31, 2019 |  | $ 694 |  | 2,189,544 | (216,111) | 9,866,203 | (3,413,701)
Balance, beginning of period, shares at Mar. 31, 2019 |  | 40,770,539 |  |  |  |  |
Issued during the period, net, shares |  | 9,403 |  |  |  |  |
Treasury shares acquired, shares |  | (39,440) |  |  |  |  |
Issued during the period, net |  |  | $ 0 |  |  |  |
Share-based compensation plans |  |  |  | 8,917 |  |  |
Net increase (decrease) during the period | $ 171,209 |  |  |  | 171,209 |  |
Net income (loss) | 342,855 |  |  |  |  | 342,855 |
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) | (56,999) |  |  |  |  | (56,999) |
Purchase of treasury shares |  |  |  |  |  |  | (8,451)
Balance, end of period at Jun. 30, 2019 | $ 8,884,160 | $ 694 |  | $ 2,198,461 | $ (44,902) | $ 10,152,059 | $ (3,422,152)
Balance, end of period, shares at Jun. 30, 2019 | 69,406,000 | 40,740,502 |  |  |  |  |

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