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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, 2016 |  | $ 3,427,741 |  | $ 1,727,598 | $ 2,187,676 | $ (439,387) | $ (48,146)
Balance (in shares) at Dec. 31, 2016 |  |  | 144,167,451 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  | 505,624 |  |  | 505,624 |  |
Other comprehensive income (loss) |  | 10,627 |  |  |  |  | 10,627
Net activity of common stock pursuant to various stock compensation plans and agreements |  | 14,957 |  | 27,897 |  | (12,940) |
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares) |  |  | 375,609 |  |  |  |
Cash dividends on common stock |  | (116,998) |  |  | (116,998) |  |
Ending balance at Dec. 31, 2017 |  | 3,841,951 |  | 1,755,495 | 2,576,302 | (452,327) | (37,519)
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)
Beginning balance at Dec. 31, 2017 |  | 3,841,951 |  | 1,755,495 | 2,576,302 | (452,327) | (37,519)
Balance (in shares) at Dec. 31, 2017 |  |  | 144,543,060 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  | 703,701 |  |  | 703,701 |  |
Other comprehensive income (loss) |  | (14,384) |  |  |  |  | (14,384)
Net activity of common stock pursuant to various stock compensation plans and agreements |  | 18,848 |  | 34,482 |  | (15,634) |
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares) |  |  | 418,303 |  |  |  |
Cash dividends on common stock |  | (125,982) |  |  | (125,982) |  |
Ending balance at Dec. 31, 2018 |  | 4,423,974 |  | 1,789,977 | 3,160,132 | (467,961) | (58,174)
Balance (in shares) at Dec. 31, 2018 |  |  | 144,961,363 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Cumulative effect of change in accounting principle related to marketable equity securities | [2] | (160) |  |  | (545) |  | 385
Net income |  | 674,035 |  |  | 674,035 |  |
Other comprehensive income (loss) |  | 39,766 |  |  |  |  | 39,766
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 |  | 20,189 |  | 34,824 |  | (14,635) |
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares) |  |  | 483,796 |  |  |  |
Cash dividends on common stock |  | (155,300) |  |  | (155,300) |  |
Ending balance at Dec. 31, 2019 |  | $ 5,017,617 |  | $ 1,826,512 | $ 3,689,377 | $ (479,864) | $ (18,408)
Balance (in shares) at Dec. 31, 2019 |  |  | 145,625,385 |  |  |  |
[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. Refer to Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements for additional information.
[2] | Represents the impact of the adoption of Accounting Standards Update (“ASU”) 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities in the first quarter of 2018. Refer to Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Annual Report on Form 10-K (“this Form 10-K”) for additional information.

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