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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid In Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income [Member]
--- | --- | --- | --- | --- | --- | ---
Stockholders' equity, beginning balance at Dec. 31, 2014 | $ 1,894,666 | $ 1,567 | $ 1,392,494 | $ 4,394,513 | $ (3,815,203) | $ (78,705)
Number of common shares, beginning balance at Dec. 31, 2014 | 156,716 |  |  |  |  |
Net income | $ 469,053 |  |  | 469,053 |  |
Other comprehensive income (loss) | (68,021) |  |  |  |  | (68,021)
Issuance of common stock for Employee Stock Purchase Plan | $ 5,496 | 1 | 5,495 |  |  |
Issuance of common stock for Employee Stock Purchase Plan, shares | 53 |  |  |  |  |
Issuance of common stock for stock options exercised | $ 46,564 | 7 | 46,557 |  |  |
Issuance of common stock for stock options exercised, shares | 727 |  |  |  |  |
Tax benefit related to stock option plans | $ 12,955 |  | 12,955 |  |  |
Treasury stock | (334,705) |  |  |  | (334,705) |
Stock-based compensation | $ 32,843 | 2 | 32,841 |  |  |
Stock-based compensation, shares | 181 |  |  |  |  |
Stockholders' equity, ending balance at Dec. 31, 2015 | $ 2,058,851 | 1,577 | 1,490,342 | 4,863,566 | (4,149,908) | (146,726)
Number of common shares, ending balance at Dec. 31, 2015 | 157,677 |  |  |  |  |
Net income | $ 521,503 |  |  | 521,503 |  |
Other comprehensive income (loss) | (69,554) |  |  |  |  | (69,554)
Issuance of common stock for Employee Stock Purchase Plan | $ 6,278 | 1 | 6,277 |  |  |
Issuance of common stock for Employee Stock Purchase Plan, shares | 53 |  |  |  |  |
Issuance of common stock for stock options exercised | $ 55,911 | 7 | 55,904 |  |  |
Issuance of common stock for stock options exercised, shares | 730 |  |  |  |  |
Tax benefit related to stock option plans | $ 13,844 |  | 13,844 |  |  |
Treasury stock | (325,759) |  |  |  | (325,759) |
Stock-based compensation | $ 40,875 | 1 | 40,874 |  |  |
Stock-based compensation, shares | 174 |  |  |  |  |
Stockholders' equity, ending balance at Dec. 31, 2016 | $ 2,301,949 | 1,586 | 1,607,241 | 5,385,069 | (4,475,667) | (216,280)
Number of common shares, ending balance at Dec. 31, 2016 | 158,634 |  |  |  |  |
Net income | $ 20,311 |  |  | 20,311 |  |
Other comprehensive income (loss) | 106,213 |  |  |  |  | 106,213
Issuance of common stock for Employee Stock Purchase Plan | $ 6,875 | 1 | 6,874 |  |  |
Issuance of common stock for Employee Stock Purchase Plan, shares | 50 |  |  |  |  |
Issuance of common stock for stock options exercised | $ 90,914 | 10 | 90,904 |  |  |
Issuance of common stock for stock options exercised, shares | 972 |  |  |  |  |
Treasury stock | $ (332,544) |  |  |  | (332,544) |
Stock-based compensation | $ 40,070 | 1 | 40,069 |  |  |
Stock-based compensation, shares | 189 |  |  |  |  |
Stockholders' equity, ending balance at Dec. 31, 2017 | $ 2,233,788 | $ 1,598 | $ 1,745,088 | $ 5,405,380 | $ (4,808,211) | $ (110,067)
Number of common shares, ending balance at Dec. 31, 2017 | 159,845 |  |  |  |  |

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