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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, 2013 |  | 343,157,231 |  |  |  |
Balance, beginning of period at Dec. 31, 2013 | $ 3,009,486 | $ 3,432 | $ 1,175,052 | $ 7,852,729 | $ (332,676) | $ (5,689,051)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 844,611 |  |  | 844,611 |  |
Total other comprehensive income (loss), net of tax | (182,267) |  |  |  | (182,267) |
Dividends | (238,300) |  |  | (238,300) |  |
Repurchase of common stock | (615,602) |  |  |  |  | (615,602)
Share-based compensation and 401(k) match made with Treasury shares | 41,991 |  | 40,848 |  |  | 1,143
Issuance of nonvested stock (in shares) |  | 15,891 |  |  |  |
Issuance of nonvested stock | 0 |  |  |  |  |
Exercise of stock options (in shares) |  | 1,001,531 |  |  |  |
Exercise of stock options | 37,785 | $ 10 | 37,775 |  |  |
Tax benefit of equity awards | 11,582 |  | 11,582 |  |  |
Ending Balance, shares at Dec. 31, 2014 |  | 344,174,653 |  |  |  |
Balance, end 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) | 468,000 | 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)

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