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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - 3 months ended Mar. 31, 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 | $ (34,417) |  |  | (34,417) |  |
Foreign currency translation adjustment | (1,984) |  |  |  | (1,984) |
Exercise of stock options | $ 485 | $ 1 | 484 |  |  |
Exercise of stock options (in shares) | 40,000 | 40,000 |  |  |  |
Stock-based compensation | $ 9,365 |  | 9,365 |  |  |
Payment of cash dividends | (4,443) |  |  | (4,443) |  |
Dividend equivalents | (30) |  |  | (30) |  |
Purchase of treasury stock | (16,928) |  |  |  |  | (16,928)
Ending Balance at Mar. 31, 2018 | $ 3,934,541 | $ 2,663 | $ 2,795,672 | $ 2,067,007 | $ 4,838 | $ (935,639)
Ending Balance (in shares) at Mar. 31, 2018 | 266,298,983 | 266,299,000 |  |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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