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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Balance
--- | --- | --- | --- | --- | --- | ---
Beginning Balance, shares at Dec. 31, 2014 |  | 344,174,653 |  |  |  |
Balance, beginning of period at Dec. 31, 2014 | $ 2,909,286 | $ 3,442 | $ 1,265,257 | $ 8,459,040 | $ (514,943) | $ (6,303,510)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 752,207 |  |  | 752,207 |  |
Total other comprehensive income (loss), net of tax | (100,262) |  |  |  | (100,262) |
Dividends | (249,262) |  |  | (249,262) |  |
Repurchase of common stock | (1,537,020) |  |  |  |  | (1,537,020)
Share-based compensation and 401(k) match made with Treasury shares | 40,851 |  | 39,457 |  |  | 1,394
Issuance of nonvested stock (in shares) |  | 162,193 |  |  |  |
Issuance of nonvested stock | 0 | $ 2 | (2) |  |  |
Exercise of stock options (in shares) |  | 518,858 |  |  |  |
Exercise of stock options | 20,179 | $ 5 | 20,174 |  |  |
Tax benefit of equity awards | 3,675 |  | 3,675 |  |  |
Ending Balance, shares at Dec. 31, 2015 |  | 344,855,704 |  |  |  |
Balance, end of period at Dec. 31, 2015 | 1,839,654 | $ 3,449 | 1,328,561 | 8,961,985 | (615,205) | (7,839,136)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 692,164 |  |  | 692,164 |  |
Total other comprehensive income (loss), net of tax | 49,824 |  |  |  | 49,824 |
Dividends | (252,321) |  |  | (252,321) |  |
Repurchase of common stock | (465,341) |  |  |  |  | (465,341)
Share-based compensation and 401(k) match made with Treasury shares | 39,826 |  | 36,956 |  |  | 2,870
Issuance of nonvested stock (in shares) |  | 272,479 |  |  |  |
Issuance of nonvested stock | 0 | $ 2 | (2) |  |  |
Exercise of stock options (in shares) |  | 466,871 |  |  |  |
Exercise of stock options | 15,782 | $ 5 | 15,777 |  |  |
Tax benefit of equity awards | $ 570 |  | 570 |  |  |
Retirement of treasury stock (in shares) | (165,000,000) | (165,000,000) |  |  |  |
Retirement of treasury stock | $ 0 | $ (1,650) |  | (8,064,155) |  | 8,065,805
Ending Balance, shares at Dec. 31, 2016 |  | 180,595,054 |  |  |  |
Balance, end of period at Dec. 31, 2016 | 1,920,158 | $ 1,806 | 1,381,862 | 1,337,673 | (565,381) | (235,802)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 521,759 |  |  | 521,759 |  |
Total other comprehensive income (loss), net of tax | 65,332 |  |  |  | 65,332 |
Dividends | (251,862) |  |  | (251,862) |  |
Repurchase of common stock | (465,263) |  |  |  |  | (465,263)
Share-based compensation and 401(k) match made with Treasury shares | 42,800 |  | 29,600 |  |  | 13,200
Issuance of nonvested stock (in shares) |  | 408,950 |  |  |  |
Issuance of nonvested stock | $ 0 | $ 4 | (4) |  |  |
Exercise of stock options (in shares) | 282,000 | 282,543 |  |  |  |
Exercise of stock options | $ 11,353 | $ 3 | 11,350 |  |  |
Ending Balance, shares at Dec. 31, 2017 |  | 181,286,547 |  |  |  |
Balance, end of period at Dec. 31, 2017 | $ 1,844,277 | $ 1,813 | $ 1,422,808 | $ 1,607,570 | $ (500,049) | $ (687,865)

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