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Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | ---
Shareholders' Equity, shares at Dec. 31, 2016 |  | 319,090,000 |  |  |
Shareholders' Equity at Dec. 31, 2016 | $ 4,659,363 | $ 3,191 | $ 3,116,490 | $ (526) | $ 1,540,208
Stock option exercises, shares |  | 2,352,000 |  |  |
Stock option exercises | 27,720 | $ 24 | 27,696 |  |
Share issuances, net of cancellations, shares |  | 1,008,000 |  |  |
Share issuances | 3,568 | $ 13 | 3,555 |  |
Dividends declared | (110,046) |  |  |  | (110,046)
Share repurchases, shares |  | (35,698,000) |  |  |
Share repurchases | (910,331) | $ (360) |  |  | (909,971)
Cash paid for shares withheld for taxes |  |  |  |  | 5,995
Excess tax benefits (deficiencies) from share-based compensation | (5,995) |  |  |  |
Share-based compensation | 24,207 |  | 24,207 |  |
Net income | 447,221 |  |  |  | 447,221
Other comprehensive income | 81 |  |  | 81 |
Shareholders' Equity, shares at Dec. 31, 2017 |  | 286,752,000 |  |  |
Shareholders' Equity at Dec. 31, 2017 | 4,154,026 | $ 2,868 | 3,171,542 | (445) | 980,061
Stock option exercises, shares |  | 605,000 |  |  |
Stock option exercises | 6,555 | $ 6 | 6,549 |  |
Share issuances, net of cancellations, shares |  | 1,210,000 |  |  |
Share issuances | 3,487 | $ 12 | 3,475 |  |
Dividends declared | (108,489) |  |  |  | (108,489)
Share repurchases, shares |  | (11,457,000) |  |  |
Share repurchases | (294,566) | $ (115) |  |  | (294,451)
Cash paid for shares withheld for taxes | 7,910 |  | 284 |  | 7,626
Share-based compensation | 20,145 |  | 20,145 |  |
Net income | 1,022,023 |  |  |  | 1,022,023
Other comprehensive income | $ 100 |  |  | 100 |
Shareholders' Equity, shares at Dec. 31, 2018 | 277,109,507 | 277,110,000 |  |  |
Shareholders' Equity at Dec. 31, 2018 | $ 4,817,782 | $ 2,771 | 3,201,427 | (345) | 1,613,929
Stock option exercises, shares |  | 547,000 |  |  |
Stock option exercises | 6,399 | $ 5 | 6,394 |  |
Share issuances, net of cancellations, shares |  | 1,013,000 |  |  |
Share issuances | 5,800 | $ 10 | 5,790 |  |
Dividends declared | (124,356) |  |  |  | (124,356)
Share repurchases, shares |  | (8,435,000) |  |  |
Share repurchases | (274,333) | $ (84) |  |  | (274,249)
Cash paid for shares withheld for taxes | 11,450 |  |  |  | 11,450
Share-based compensation | 21,538 |  | 21,538 |  |
Net income | 1,016,700 |  |  |  | 1,016,700
Other comprehensive income | $ 100 |  |  | 100 |
Shareholders' Equity, shares at Dec. 31, 2019 | 270,235,297 | 270,235,000 |  |  |
Shareholders' Equity at Dec. 31, 2019 | $ 5,458,180 | $ 2,702 | $ 3,235,149 | $ (245) | $ 2,220,574

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