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Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | AOCI Attributable to Parent [Member] | Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjustment Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total equity | $ 5,118,693 | $ 1,529 | $ 726,879 | $ 4,774,422 | $ (425,183) | $ (5,831) | $ 46,877 |  |
Stockholders' Equity, Other |  |  |  |  |  |  |  | $ 0 |
Net income | 132,546 |  |  | 132,546 |  |  |  |  |
Purchase of treasury stock | (633,553) |  |  |  | (633,553) |  |  |  |
Exercise of stock options and stock based compensation issuances | 4,573 |  | (17,828) |  | 22,401 |  |  |  |
Employee stock purchase plan issuances | 729 |  | (607) |  | 1,336 |  |  |  |
Stock-based compensation | 16,802 |  | 16,802 |  |  |  |  |  |
Dividends declared | (28,951) |  |  | (28,951) |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 556 |  |  |  |  | 556 |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest | (8) |  |  |  |  |  | (8) |  |
Capital contributions | 2,335 |  |  |  |  |  | 2,335 |  |
Total equity | 4,705,080 | 1,529 | 723,109 | 4,816,286 | (879,820) | (5,553) | 49,529 |  |
Net income | 75,670 |  |  | 75,670 |  |  |  |  |
Purchase of treasury stock | (157,529) |  |  |  | (157,529) |  |  |  |
Exercise of stock options and stock based compensation issuances | 643 |  | (716) |  | 1,359 |  |  |  |
Employee stock purchase plan issuances | 425 |  | (566) |  | 991 |  |  |  |
Stock-based compensation | 3,419 |  | 3,419 |  |  |  |  |  |
Dividends declared | (13,939) |  |  | (13,939) |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 278 |  |  |  |  | 278 |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest | (7) |  |  |  |  |  | (7) |  |
Capital contributions | (318) |  |  |  |  |  | (318) |  |
Total equity | 4,613,722 | 1,529 | 725,246 | 4,878,017 | (1,034,999) | (5,275) | 49,204 |  |
Total equity | 4,927,476 | 1,529 | 717,272 | 5,164,086 | (1,000,454) | (7,198) | 52,241 |  |
Stockholders' Equity, Other |  |  |  |  |  |  |  | (595) |
Stockholders' Equity, Other | Accounting Standards Update 2016-13 |  |  |  |  |  |  |  | $ (600) | $ (595)
Net income | 224,365 |  |  | 224,365 |  |  |  |  |
Purchase of treasury stock | (179,648) |  |  |  | (179,648) |  |  |  |
Exercise of stock options and stock based compensation issuances | 6,863 |  | (24,235) |  | 31,098 |  |  |  |
Employee stock purchase plan issuances | 704 |  | 106 |  | 598 |  |  |  |
Stock-based compensation | 16,279 |  | 16,279 |  |  |  |  |  |
Dividends declared | (35,283) |  |  | (35,283) |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 5,150 |  |  |  |  | 5,150 |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest | (20) |  |  |  |  |  | (20) |  |
Capital contributions | (4,502) |  |  |  |  |  | (4,502) |  |
Total equity | 4,834,492 | 1,529 | 708,668 | 5,245,935 | (1,162,811) | (6,486) | 47,657 |  |
Net income | 127,866 |  |  | 127,866 |  |  |  |  |
Purchase of treasury stock | (253) |  |  |  | (253) |  |  |  |
Exercise of stock options and stock based compensation issuances | 11,632 |  | (2,790) |  | 14,422 |  |  |  |
Employee stock purchase plan issuances | 334 |  | 98 |  | 236 |  |  |  |
Stock-based compensation | 3,446 |  | 3,446 |  |  |  |  |  |
Dividends declared | (21,228) |  |  | (21,228) |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 4,438 |  |  |  |  | 4,438 |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest | 1 |  |  |  |  |  | 1 |  |
Capital contributions | 61 |  |  |  |  |  | 61 |  |
Total equity | $ 4,960,789 | $ 1,529 | $ 709,422 | $ 5,352,573 | $ (1,148,406) | $ (2,048) | $ 47,719 |  |

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