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Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Balance [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning Balance, shares at Dec. 31, 2012 |  | 341,265,838 |  |  |  |
Beginning Balance at Dec. 31, 2012 | $ 2,557,624 | $ 3,413 | $ 1,066,069 | $ 7,306,424 | $ (607,678) | $ (5,210,604)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 733,993 |  |  | 733,993 |  |
Total other comprehensive loss, net of tax (Note 10) | 275,002 |  |  |  | 275,002 |
Dividends | (187,688) |  |  | (187,688) |  |
Repurchase of common stock | (479,231) |  |  |  |  | (479,231)
Share-based compensation and 401(k) match made with Treasury shares | 41,508 |  | 40,724 |  |  | 784
Issuance of nonvested stock (in shares) |  | 492,755 |  |  |  |
Issuance of nonvested stock |  | $ (5) | (5) |  |  |
Exercise of stock options | 50,567 | $ 14 | 50,553 |  |  |
Exercise of stock options (in shares) |  | 1,398,638 |  |  |  |
Tax benefit of stock options and nonvested stock | 17,711 |  | 17,711 |  |  |
Ending Balance, shares at Dec. 31, 2013 |  | 343,157,231 |  |  |  |
Ending Balance 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 loss, net of tax (Note 10) | (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 | 0 |  |  |
Exercise of stock options | 37,785 | $ 10 | 37,775 |  |  |
Exercise of stock options (in shares) |  | 1,001,531 |  |  |  |
Tax benefit of stock options and nonvested stock | 11,582 |  | 11,582 |  |  |
Ending Balance, shares at Dec. 31, 2014 |  | 344,174,653 |  |  |  |
Ending Balance 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 loss, net of tax (Note 10) | (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 |  | $ (2) | (2) |  |  |
Exercise of stock options | $ 20,179 | $ 5 | 20,174 |  |  |
Exercise of stock options (in shares) | 517,000 | 518,858 |  |  |  |
Tax benefit of stock options and nonvested stock | $ 3,675 |  | 3,675 |  |  |
Ending Balance, shares at Dec. 31, 2015 |  | 344,855,704 |  |  |  |
Ending Balance at Dec. 31, 2015 | $ 1,839,654 | $ 3,449 | $ 1,328,561 | $ 8,961,985 | $ (615,205) | $ (7,839,136)

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