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Consolidated Statements of Changes in Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Capital In Excess of Par Value | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2016 |  | $ 1,590 | $ 955,461 | $ 384,018 | $ (37,955)
Beginning balance, shares at Dec. 31, 2016 |  | 159,031 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Purchase and retirement of common stock |  | $ (44) | (20,243) | (227,827) |
Purchase and retirement of common stock, shares |  | (4,403) |  |  |
Issuance of common stock under the employee stock purchase plan |  | $ 1 | 3,280 |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 71 |  |  |
Issuance of common stock upon exercise of stock options |  | $ 24 | 50,263 |  |
Issuance of common stock upon exercise of stock options, shares | 2,370 | 2,370 |  |  |
Stock-based compensation |  |  | 36,366 |  |
Net income | $ 404,389 |  |  | 404,389 |
Dividends declared ($0.68, $0.63 and $0.58 per share) | (91,444) |  |  | (91,444) |
Other comprehensive income (loss) | 18,047 |  |  |  | 18,047
Ending balance at Dec. 31, 2017 | $ 1,476,839 | $ 1,571 | 1,027,709 | 467,467 | (19,908)
Ending balance, shares at Dec. 31, 2017 |  | 157,069 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Purchase and retirement of common stock |  | $ (67) | (32,823) | (371,867) |
Purchase and retirement of common stock, shares |  | (6,744) |  |  |
Issuance of common stock under the employee stock purchase plan |  |  | 4,170 |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 77 |  |  |
Issuance of common stock upon exercise of stock options |  | $ 32 | 83,780 |  |
Issuance of common stock upon exercise of stock options, shares | 3,232 | 3,232 |  |  |
Stock-based compensation |  |  | 23,805 |  |
Net income | $ 505,868 |  |  | 505,868 |
Dividends declared ($0.68, $0.63 and $0.58 per share) | (97,900) |  |  | (97,900) |
Other comprehensive income (loss) | (13,092) |  |  |  | (13,092)
Ending balance at Dec. 31, 2018 | $ 1,593,147 | $ 1,536 | 1,106,641 | 517,970 | (33,000)
Ending balance, shares at Dec. 31, 2018 | 153,634 | 153,634 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Purchase and retirement of common stock |  | $ (62) | (33,210) | (315,076) |
Purchase and retirement of common stock, shares |  | (6,225) |  |  |
Issuance of common stock under the employee stock purchase plan |  | $ 1 | 4,224 |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 93 |  |  |
Issuance of common stock upon exercise of stock options |  | $ 22 | 56,663 |  |
Issuance of common stock upon exercise of stock options, shares | 2,243 | 2,243 |  |  |
Stock-based compensation |  |  | 24,582 |  |
Net income | $ 501,426 |  |  | 501,426 |
Dividends declared ($0.68, $0.63 and $0.58 per share) | (102,435) |  |  | (102,435) |
Other comprehensive income (loss) | 9,496 |  |  |  | 9,496
Ending balance at Dec. 31, 2019 | $ 1,738,778 | $ 1,497 | $ 1,158,900 | $ 601,885 | $ (23,504)
Ending balance, shares at Dec. 31, 2019 | 149,745 | 149,745 |  |  |

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