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v3.8.0.1

Consolidated Statements Of Changes In Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Capital In Excess Of Par Value [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 |  | $ 1,667 | $ 834,615 | $ 420,226 | $ (8,895)
Beginning balance, shares at Dec. 31, 2014 |  | 166,688 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Purchase and retirement of common stock |  | $ (60) | (22,984) | (266,543) |
Purchase and retirement of common stock, shares |  | (5,951) |  |  |
Issuance of common stock under the employee stock purchase plan |  | $ 1 | 2,798 |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 69 |  |  |
Issuance of common stock upon exercise of stock options |  | $ 29 | 62,716 |  |
Issuance of common stock upon exercise of stock options, shares | 2,927 | 2,927 |  |  |
Stock-based compensation | $ (17,312) |  | 17,312 |  |
Tax benefit on stock options exercised |  |  | 16,056 |  |
Net income | 331,655 |  |  | 331,655 |
Dividends declared ($0.58, $0.54 and $0.50 per share) | (82,478) |  |  | (82,478) |
Other comprehensive gain (loss) | (16,395) |  |  |  | (16,395)
Total Equity at Dec. 31, 2015 | $ 1,289,720 | $ 1,637 | 910,513 | 402,860 | (25,290)
Ending balance, shares at Dec. 31, 2015 |  | 163,733 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative effect upon adoption of ASU 2016-09 |  |  | 0 | 0 |
Purchase and retirement of common stock |  | $ (66) | (28,306) | (266,002) |
Purchase and retirement of common stock, shares |  | (6,600) |  |  |
Issuance of common stock under the employee stock purchase plan |  | $ 1 | 3,357 |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 88 |  |  |
Issuance of common stock upon exercise of stock options |  | $ 18 | 44,896 |  |
Issuance of common stock upon exercise of stock options, shares | 1,809 | 1,810 |  |  |
Stock-based compensation | $ (16,017) |  | 16,017 |  |
Tax benefit on stock options exercised |  |  | 8,984 |  |
Net income | 333,817 |  |  | 333,817 |
Dividends declared ($0.58, $0.54 and $0.50 per share) | (86,657) |  |  | (86,657) |
Other comprehensive gain (loss) | (12,665) |  |  |  | (12,665)
Total Equity at Dec. 31, 2016 | $ 1,303,114 | $ 1,590 | 955,461 | 384,018 | (37,955)
Ending balance, shares at Dec. 31, 2016 | 159,031 | 159,031 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative effect upon adoption of ASU 2016-09 |  |  | 0 | 0 |
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) |  | 36,366 |  |
Tax benefit on stock options exercised |  |  | 0 |  |
Net income | 404,389 |  |  | 404,389 |
Dividends declared ($0.58, $0.54 and $0.50 per share) | (91,444) |  |  | (91,444) |
Other comprehensive gain (loss) | 18,047 |  |  |  | 18,047
Total Equity 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 | 157,069 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative effect upon adoption of ASU 2016-09 |  |  | $ 2,582 | $ (1,669) |

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