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Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss), Net of Tax [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ 3,002,528 | $ 144,486 | $ 637 | $ 906,732 | $ 1,985,569 | $ (24,623) | $ (10,273)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 364,149 |  |  |  | 364,149 |  |
Other comprehensive loss, net of tax | 104,135 |  |  |  |  | 104,135 |
Proceeds from stock option exercises/stock unit conversions (399,244 shares, 548,238 shares, and 1,150,920 shares during 2019, 2018, and 2017, respectively) | 67,746 |  | 5 | 33,616 | (10,414) |  | 44,539
Stock-based compensation expense recognized in earnings | 13,013 |  |  | 13,013 |  |  |
Purchase of treasury stock (716,062 shares,1,037,982 shares, and 1,149,555 shares during 2019, 2018, and 2017, respectively) | (101,473) |  |  |  |  |  | (101,473)
Cash dividends paid on preferred stock (approximately $1.34 per share in 2019, 2018, and 2017) | (8,063) |  |  |  | (8,063) |  |
Cash dividends – common stock ($2.80 per share, $2.58 per share, and $2.25 per share in 2019, 2018, and 2017, respectively) | (144,172) |  |  |  | (144,172) |  |
Balance at Dec. 31, 2017 | 3,297,863 | 144,486 | 642 | 953,361 | 2,187,069 | 79,512 | (67,207)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | (2,285) |  |  |  | (2,285) |  |
Stockholders' Equity, as adjusted at the beginning of period | 3,295,578 | 144,486 | 642 | 953,361 | 2,184,784 | 79,512 | (67,207)
Net income | 454,918 |  |  |  | 454,918 |  |
Other comprehensive loss, net of tax | (152,647) |  |  |  |  | (152,647) |
Reclassification of certain income tax effects related to U.S. statutory federal income tax rate under the Tax Cuts and Jobs Act |  |  |  |  | (9,535) | 9,535 |
Proceeds from stock option exercises/stock unit conversions (399,244 shares, 548,238 shares, and 1,150,920 shares during 2019, 2018, and 2017, respectively) | 31,647 |  |  |  | (16,653) |  | 48,300
Stock-based compensation expense recognized in earnings | 13,943 |  |  | 13,943 |  |  |
Purchase of treasury stock (716,062 shares,1,037,982 shares, and 1,149,555 shares during 2019, 2018, and 2017, respectively) | (101,010) |  |  |  |  |  | (101,010)
Cash dividends paid on preferred stock (approximately $1.34 per share in 2019, 2018, and 2017) | (8,063) |  |  |  | (8,063) |  |
Cash dividends – common stock ($2.80 per share, $2.58 per share, and $2.25 per share in 2019, 2018, and 2017, respectively) | (165,449) |  |  |  | (165,449) |  |
Balance at Dec. 31, 2018 | 3,368,917 | 144,486 | 642 | 967,304 | 2,440,002 | (63,600) | (119,917)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | (14,672) |  |  |  | (14,672) |  |
Stockholders' Equity, as adjusted at the beginning of period | 3,354,245 | 144,486 | 642 | 967,304 | 2,425,330 | (63,600) | (119,917)
Net income | 443,599 |  |  |  | 443,599 |  |
Other comprehensive loss, net of tax | 330,970 |  |  |  |  | 330,970 |
Proceeds from stock option exercises/stock unit conversions (399,244 shares, 548,238 shares, and 1,150,920 shares during 2019, 2018, and 2017, respectively) | 20,770 |  |  |  | (16,326) |  | 37,096
Stock-based compensation expense recognized in earnings | 15,946 |  |  | 15,946 |  |  |
Purchase of treasury stock (716,062 shares,1,037,982 shares, and 1,149,555 shares during 2019, 2018, and 2017, respectively) | (68,793) |  |  |  |  |  | (68,793)
Cash dividends paid on preferred stock (approximately $1.34 per share in 2019, 2018, and 2017) | (8,063) |  |  |  | (8,063) |  |
Cash dividends – common stock ($2.80 per share, $2.58 per share, and $2.25 per share in 2019, 2018, and 2017, respectively) | (177,006) |  |  |  | (177,006) |  |
Balance at Dec. 31, 2019 | $ 3,911,668 | $ 144,486 | $ 642 | $ 983,250 | $ 2,667,534 | $ 267,370 | $ (151,614)

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