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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 | $ 3,982,493 | $ 2,662 | $ 2,785,823 | $ 2,105,897 | $ 6,822 | $ (918,711)
Beginning Balance (in shares) at Dec. 31, 2017 | 266,259,083 | 266,259,000 |  |  |  |
Net loss | $ (45,130) |  |  | (45,130) |  |
Foreign currency translation adjustment | (3,514) |  |  |  | (3,514) |
Exercise of stock options | $ 485 | $ 1 | 484 |  |  |
Exercise of stock options (in shares) | 40,000 | 40,000 |  |  |  |
Issuance of common stock |  | $ 4 | (4) |  |  |
Issuance of common stock (in shares) |  | 381,000 |  |  |  |
Vesting of restricted stock units (in shares) |  | 10,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (2,000) |  |  |  |
Stock-based compensation | $ 19,272 |  | 19,272 |  |  |
Payment of cash dividends | (13,275) |  |  | (13,275) |  |
Dividend equivalents | (113) |  |  | (113) |  |
Purchase of treasury stock | (59,879) |  |  |  |  | (59,879)
Ending Balance at Jun. 30, 2018 | $ 3,880,339 | $ 2,667 | $ 2,805,575 | $ 2,047,379 | $ 3,308 | $ (978,590)
Ending Balance (in shares) at Jun. 30, 2018 | 266,687,633 | 266,688,000 |  |  |  |

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