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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, 2015 |  | 349,149,000 |  |  |
Shareholders' Equity at Dec. 31, 2015 | $ 4,759,325 | $ 3,491 | $ 3,093,802 | $ (609) | $ 1,662,641
Stock option exercises, shares |  | 498,000 |  |  |
Stock option exercises | 5,845 | $ 5 | 5,840 | 0 | 0
Share issuances, net of cancellations, shares |  | 530,000 |  |  |
Share issuances, net of cancellations | 8,856 | $ 5 | 8,851 |  |
Dividends declared | (122,240) |  | 0 |  | (122,240)
Share repurchases, shares |  | (31,087,000) |  |  |
Share repurchases | (603,206) | $ (310) |  |  | (602,896)
Share-based compensation | 18,626 | $ 0 | 18,626 | 0 | 0
Excess tax benefits (deficiencies) from share-based compensation | (10,629) |  | (10,629) |  |
Net income | 602,703 |  |  |  | 602,703
Other comprehensive income | 83 |  |  | 83 |
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 |  |
Cumulative Effect on Retained Earnings, Net of Tax | 18,238 | $ 0 | (406) | 0 | 18,644
Share issuances, net of cancellations, shares |  | 730,000 |  |  |
Share issuances, net of cancellations | 3,565 | $ 10 | 3,555 |  |
Dividends declared | (110,046) |  | 0 |  | (110,046)
Share repurchases, shares |  | (35,420,000) |  |  |
Share repurchases | (916,323) | $ (357) |  |  | (915,966)
Share-based compensation | 24,207 | $ 0 | 24,207 | 0 | 0
Excess tax benefits (deficiencies) from share-based compensation | 0 |  | 0 |  |
Net income | 447,221 |  |  |  | 447,221
Other comprehensive income | $ 81 |  |  | 81 |
Shareholders' Equity, shares at Dec. 31, 2017 | 286,752,436 | 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 | 0 | 0
Cumulative Effect on Retained Earnings, Net of Tax | 22,411 | $ 0 |  |  | 22,411
Share issuances, net of cancellations, shares |  | 935,000 |  |  |
Share issuances, net of cancellations | 3,484 | $ 9 | 3,475 |  |
Dividends declared | (108,489) |  | 0 |  | (108,489)
Share repurchases, shares |  | (11,182,000) |  |  |
Share repurchases | (302,473) | $ (112) | (284) |  | (302,077)
Share-based compensation | 20,145 | $ 0 | 20,145 | 0 | 0
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

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