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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 Stock
--- | --- | --- | --- | --- | --- | ---
Balance, beginning of period (in shares) at Dec. 31, 2016 |  | 180,595,054 |  |  |  |
Balance, beginning 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 |  |
Other comprehensive income (loss), net of tax | 65,332 |  |  |  | 65,332 |
Dividends | (251,862) |  |  | (251,862) |  |
Repurchase of common stock | $ (465,263) |  |  |  |  | (465,263)
Options granted during period (in shares) | 0 |  |  |  |  |
Share-based compensation | $ 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) |  | 282,543 |  |  |  |
Exercise of stock options | 11,353 | $ 3 | 11,350 |  |  |
Balance, end of period (in 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 531,451 |  |  | 531,451 |  |
Other comprehensive income (loss), net of tax | (21,287) |  |  |  | (21,287) |
Dividends | (245,810) |  |  | (245,810) |  |
Repurchase of common stock | $ (390,606) |  |  |  |  | (390,606)
Options granted during period (in shares) | 0 |  |  |  |  |
Share-based compensation | $ 46,375 |  | 33,293 |  |  | 13,082
Issuance of nonvested stock (in shares) |  | 485,005 |  |  |  |
Issuance of nonvested stock | 0 | $ 4 | (4) |  |  |
Exercise of stock options (in shares) |  | 159,673 |  |  |  |
Exercise of stock options | 3,525 | $ 2 | 3,523 |  |  |
Reclassification of certain tax effects | 0 |  |  | 108,348 | (108,348) |
Balance, end of period (in shares) at Dec. 31, 2018 |  | 181,931,225 |  |  |  |
Balance, end of period at Dec. 31, 2018 | 1,773,949 | $ 1,819 | 1,459,620 | 2,007,583 | (629,684) | (1,065,389)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 423,635 |  |  | 423,635 |  |
Other comprehensive income (loss), net of tax | 92,735 |  |  |  | 92,735 |
Dividends | (237,221) |  |  | (237,221) |  |
Repurchase of common stock | $ (296,520) |  |  |  |  | (296,520)
Options granted during period (in shares) | 0 |  |  |  |  |
Share-based compensation | $ 43,832 |  | 27,804 |  |  | 16,028
Issuance of nonvested stock (in shares) |  | 715,579 |  |  |  |
Issuance of nonvested stock | $ 0 | $ 7 | (7) |  |  |
Exercise of stock options (in shares) | 168,000 | 169,732 |  |  |  |
Exercise of stock options | $ 3,589 | $ 2 | 3,587 |  |  |
Balance, end of period (in shares) at Dec. 31, 2019 |  | 182,816,536 |  |  |  |
Balance, end of period at Dec. 31, 2019 | $ 1,803,999 | $ 1,828 | $ 1,491,004 | $ 2,193,997 | $ (536,949) | $ (1,345,881)

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