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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - 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 |  | 266,259,000 |  |  |  |
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 |  |  |  |
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 |  | 266,299,000 |  |  |  |
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 |  | 266,259,000 |  |  |  |
Net loss | (120,172) |  |  | (120,172) |  |
Foreign currency translation adjustment | (1,994) |  |  |  | (1,994) |
Exercise of stock options | 485 | $ 1 | 484 |  |  |
Exercise of stock options (in shares) |  | 40,000 |  |  |  |
Issuance of common stock |  | $ 4 | (4) |  |  |
Issuance of common stock (in shares) |  | 381,000 |  |  |  |
Vesting of restricted stock units |  | $ 4 | (4) |  |  |
Vesting of restricted stock units (in shares) |  | 416,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (6,000) |  |  |  |
Stock-based compensation | 28,449 |  | 28,449 |  |  |
Payment of cash dividends | (21,960) |  |  | (21,960) |  |
Dividend equivalents | (219) |  |  | (219) |  |
Purchase of treasury stock | (111,655) |  |  |  |  | (111,655)
Ending Balance at Sep. 30, 2018 | 3,755,427 | $ 2,671 | 2,814,748 | 1,963,546 | 4,828 | (1,030,366)
Ending Balance (in shares) at Sep. 30, 2018 |  | 267,090,000 |  |  |  |
Beginning Balance at Mar. 31, 2018 | 3,934,541 | $ 2,663 | 2,795,672 | 2,067,007 | 4,838 | (935,639)
Beginning Balance (in shares) at Mar. 31, 2018 |  | 266,299,000 |  |  |  |
Net loss | (10,713) |  |  | (10,713) |  |
Foreign currency translation adjustment | (1,530) |  |  |  | (1,530) |
Issuance of common stock |  | $ 4 | (4) |  |  |
Issuance of common stock (in shares) |  | 381,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (2,000) |  |  |  |
Stock-based compensation | 9,907 |  | 9,907 |  |  |
Payment of cash dividends | (8,832) |  |  | (8,832) |  |
Dividend equivalents | (83) |  |  | (83) |  |
Purchase of treasury stock | (42,951) |  |  |  |  | (42,951)
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 |  | 266,688,000 |  |  |  |
Net loss | (75,042) |  |  | (75,042) |  |
Foreign currency translation adjustment | 1,520 |  |  |  | 1,520 |
Forfeitures of restricted stock (in shares) |  | (4,000) |  |  |  |
Stock-based compensation | 9,177 |  | 9,177 |  |  |
Payment of cash dividends | (8,685) |  |  | (8,685) |  |
Dividend equivalents | (106) |  |  | (106) |  |
Purchase of treasury stock | (51,776) |  |  |  |  | (51,776)
Ending Balance at Sep. 30, 2018 | 3,755,427 | $ 2,671 | 2,814,748 | 1,963,546 | 4,828 | (1,030,366)
Ending Balance (in shares) at Sep. 30, 2018 |  | 267,090,000 |  |  |  |
Beginning Balance at Dec. 31, 2018 | $ 3,505,423 | $ 2,673 | 2,827,154 | 1,753,557 | 2,487 | (1,080,448)
Beginning Balance (in shares) at Dec. 31, 2018 | 267,315,526 | 267,316,000 |  |  |  |
Net loss | $ (28,614) |  |  | (28,614) |  |
Foreign currency translation adjustment | 944 |  |  |  | 944 |
Forfeitures of restricted stock (in shares) |  | (1,000) |  |  |  |
Stock-based compensation | 9,338 |  | 9,338 |  |  |
Payment of cash dividends | (8,499) |  |  | (8,499) |  |
Dividend equivalents | (110) |  |  | (110) |  |
Purchase of treasury stock | (75,113) |  |  |  |  | (75,113)
Ending Balance at Mar. 31, 2019 | 3,403,369 | $ 2,673 | 2,836,492 | 1,716,334 | 3,431 | (1,155,561)
Ending Balance (in shares) at Mar. 31, 2019 |  | 267,353,000 |  |  |  |
Beginning Balance at Dec. 31, 2018 | $ 3,505,423 | $ 2,673 | 2,827,154 | 1,753,557 | 2,487 | (1,080,448)
Beginning Balance (in shares) at Dec. 31, 2018 | 267,315,526 | 267,316,000 |  |  |  |
Net loss | $ (339,780) |  |  | (339,780) |  |
Foreign currency translation adjustment | 2,646 |  |  |  | 2,646 |
Exercise of stock options | $ 9,219 | $ 7 | 9,212 |  |  |
Exercise of stock options (in shares) | 700,000 | 700,000 |  |  |  |
Vesting of restricted stock units |  | $ 12 | (12) |  |  |
Vesting of restricted stock units (in shares) |  | 1,210,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (2,000) |  |  |  |
Stock-based compensation | $ 30,058 |  | 30,058 |  |  |
Payment of cash dividends | (24,690) |  |  | (24,690) |  |
Dividend equivalents | (396) |  |  | (396) |  |
Purchase of treasury stock | (239,494) |  |  |  |  | (239,494)
Ending Balance at Sep. 30, 2019 | $ 2,942,986 | $ 2,692 | 2,866,412 | 1,388,691 | 5,133 | (1,319,942)
Ending Balance (in shares) at Sep. 30, 2019 | 269,223,800 | 269,224,000 |  |  |  |
Beginning Balance at Mar. 31, 2019 | $ 3,403,369 | $ 2,673 | 2,836,492 | 1,716,334 | 3,431 | (1,155,561)
Beginning Balance (in shares) at Mar. 31, 2019 |  | 267,353,000 |  |  |  |
Net loss | (49,447) |  |  | (49,447) |  |
Foreign currency translation adjustment | 848 |  |  |  | 848 |
Exercise of stock options | 9,219 | $ 7 | 9,212 |  |  |
Exercise of stock options (in shares) |  | 700,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (1,000) |  |  |  |
Stock-based compensation | 11,050 |  | 11,050 |  |  |
Payment of cash dividends | (8,344) |  |  | (8,344) |  |
Dividend equivalents | (126) |  |  | (126) |  |
Purchase of treasury stock | (88,258) |  |  |  |  | (88,258)
Ending Balance at Jun. 30, 2019 | 3,278,311 | $ 2,688 | 2,856,746 | 1,658,417 | 4,279 | (1,243,819)
Ending Balance (in shares) at Jun. 30, 2019 |  | 268,791,000 |  |  |  |
Net loss | (261,719) |  |  | (261,719) |  |
Foreign currency translation adjustment | 854 |  |  |  | 854 |
Stock-based compensation | 9,670 |  | 9,670 |  |  |
Payment of cash dividends | (7,847) |  |  | (7,847) |  |
Dividend equivalents | (160) |  |  | (160) |  |
Purchase of treasury stock | (76,123) |  |  |  |  | (76,123)
Ending Balance at Sep. 30, 2019 | $ 2,942,986 | $ 2,692 | $ 2,866,412 | $ 1,388,691 | $ 5,133 | $ (1,319,942)
Ending Balance (in shares) at Sep. 30, 2019 | 269,223,800 | 269,224,000 |  |  |  |

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