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Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Common Stock and Additional Paid-In Capital | Retained Earnings | Treasury Stock | AOCI, Net of Tax
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 |  | $ 3,841,951 |  | $ 1,755,495 | $ 2,576,302 | $ (452,327) | $ (37,519)
Beginning balance (in shares) at Dec. 31, 2017 |  |  | 144,543,060 |  |  |  |
Beginning balance at Dec. 31, 2017 |  | 3,841,951 |  | 1,755,495 | 2,576,302 | (452,327) | (37,519)
Beginning balance (in shares) at Dec. 31, 2017 |  |  | 144,543,060 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate | [1] | 0 |  |  | 6,656 |  | (6,656)
Net income |  | 359,381 |  |  | 359,381 |  |
Other comprehensive income (loss) |  | (27,677) |  |  |  |  | (27,677)
Net activity of common stock pursuant to various stock compensation plans and agreements |  | (618) |  | 14,543 |  | (15,161) |
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares) |  |  | 361,569 |  |  |  |
Cash dividends on common stock |  | (58,593) |  |  | (58,593) |  |
Ending balance at Jun. 30, 2018 |  | 4,114,284 |  | 1,770,038 | 2,883,201 | (467,488) | (71,467)
Ending balance (in shares) at Jun. 30, 2018 |  |  | 144,904,629 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle | [2] | (160) |  |  | (545) |  | 385
Beginning balance at Mar. 31, 2018 |  | 3,978,755 |  | 1,761,653 | 2,740,179 | (467,273) | (55,804)
Beginning balance (in shares) at Mar. 31, 2018 |  |  | 144,872,525 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  | 172,349 |  |  | 172,349 |  |
Other comprehensive income (loss) |  | (15,663) |  |  |  |  | (15,663)
Net activity of common stock pursuant to various stock compensation plans and agreements |  | 8,170 |  | 8,385 |  | (215) |
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares) |  |  | 32,104 |  |  |  |
Cash dividends on common stock |  | (29,327) |  |  | (29,327) |  |
Ending balance at Jun. 30, 2018 |  | 4,114,284 |  | 1,770,038 | 2,883,201 | (467,488) | (71,467)
Ending balance (in shares) at Jun. 30, 2018 |  |  | 144,904,629 |  |  |  |
Beginning balance at Dec. 31, 2018 |  | 4,423,974 |  | 1,789,977 | 3,160,132 | (467,961) | (58,174)
Beginning balance (in shares) at Dec. 31, 2018 |  |  | 144,961,363 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  | 314,404 |  |  | 314,404 |  |
Other comprehensive income (loss) |  | 48,202 |  |  |  |  | 48,202
Warrants exercised |  | 4,443 |  | 1,711 |  | 2,732 |
Warrants exercised (in shares) |  |  | 180,226 |  |  |  |
Net activity of common stock pursuant to various stock compensation plans and agreements |  | 3,205 |  | 17,374 |  | (14,169) |
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares) |  |  | 404,980 |  |  |  |
Cash dividends on common stock |  | (74,303) |  |  | (74,303) |  |
Ending balance at Jun. 30, 2019 |  | 4,734,593 |  | 1,809,062 | 3,414,901 | (479,398) | (9,972)
Ending balance (in shares) at Jun. 30, 2019 |  |  | 145,546,569 |  |  |  |
Beginning balance at Mar. 31, 2019 |  | 4,591,930 |  | 1,799,124 | 3,305,054 | (479,265) | (32,983)
Beginning balance (in shares) at Mar. 31, 2019 |  |  | 145,501,301 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  | 150,380 |  |  | 150,380 |  |
Other comprehensive income (loss) |  | 23,011 |  |  |  |  | 23,011
Net activity of common stock pursuant to various stock compensation plans and agreements |  | 9,805 |  | 9,938 |  | (133) |
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares) |  |  | 45,268 |  |  |  |
Cash dividends on common stock |  | (40,533) |  |  | (40,533) |  |
Ending balance at Jun. 30, 2019 |  | $ 4,734,593 |  | $ 1,809,062 | $ 3,414,901 | $ (479,398) | $ (9,972)
Ending balance (in shares) at Jun. 30, 2019 |  |  | 145,546,569 |  |  |  |
[1] | Represents amounts reclassified from AOCI to retained earnings due to the early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income in the first quarter of 2018.
[2] |
|  | Common Stock and Additional Paid-in Capital |  | Retained Earnings |  | Treasury Stock |  | AOCI, Net of Tax |  | Total Stockholders’ Equity
|  | Shares |  | Amount |  |  |  |
BALANCE, JANUARY 1, 2018 |  | 144,543,060 |  |  | $ | 1,755,495 |  |  | $ | 2,576,302 |  |  | $ | (452,327 | ) |  | $ | (37,519 | ) |  | $ | 3,841,951 |
Cumulative effect of change in accounting principle related to marketable equity securities (1) |  | — |  |  | — |  |  | (545 | ) |  | — |  |  | 385 |  |  | (160 | )
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate (2) |  | — |  |  | — |  |  | 6,656 |  |  | — |  |  | (6,656 | ) |  | — |
Net income |  | — |  |  | — |  |  | 359,381 |  |  | — |  |  | — |  |  | 359,381 |
Other comprehensive loss |  | — |  |  | — |  |  | — |  |  | — |  |  | (27,677 | ) |  | (27,677 | )
Net activity of common stock pursuant to various stock compensation plans and agreements |  | 361,569 |  |  | 14,543 |  |  | — |  |  | (15,161 | ) |  | — |  |  | (618 | )
Cash dividends on common stock ($0.40 per share) |  | — |  |  | — |  |  | (58,593 | ) |  | — |  |  | — |  |  | (58,593 | )
BALANCE, JUNE 30, 2018 |  | 144,904,629 |  |  | $ | 1,770,038 |  |  | $ | 2,883,201 |  |  | $ | (467,488 | ) |  | $ | (71,467 | ) |  | $ | 4,114,284 |
BALANCE, JANUARY 1, 2019 |  | 144,961,363 |  |  | $ | 1,789,977 |  |  | $ | 3,160,132 |  |  | $ | (467,961 | ) |  | $ | (58,174 | ) |  | $ | 4,423,974 |
Cumulative effect of change in accounting principle related to leases (3) |  | — |  |  | — |  |  | 14,668 |  |  | — |  |  | — |  |  | 14,668 |
Net income |  | — |  |  | — |  |  | 314,404 |  |  | — |  |  | — |  |  | 314,404 |
Other comprehensive income |  | — |  |  | — |  |  | — |  |  | — |  |  | 48,202 |  |  | 48,202 |
Warrants exercised |  | 180,226 |  |  | 1,711 |  |  | — |  |  | 2,732 |  |  | — |  |  | 4,443 |
Net activity of common stock pursuant to various stock compensation plans and agreements |  | 404,980 |  |  | 17,374 |  |  | — |  |  | (14,169 | ) |  | — |  |  | 3,205 |
Cash dividends on common stock ($0.505 per share) |  | — |  |  | — |  |  | (74,303 | ) |  | — |  |  | — |  |  | (74,303 | )
BALANCE, JUNE 30, 2019 |  | 145,546,569 |  |  | $ | 1,809,062 |  |  | $ | 3,414,901 |  |  | $ | (479,398 | ) |  | $ | (9,972 | ) |  | $ | 4,734,593 |

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