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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, 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 |  | 267,316,000 |  |  |  |
Net loss | (28,614) |  |  | (28,614) |  |
Foreign currency translation adjustment | 944 |  |  |  | 944 |
Vesting of restricted stock units (in shares) |  | 38,000 |  |  |  |
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 |  | 267,316,000 |  |  |  |
Net loss | (78,061) |  |  | (78,061) |  |
Foreign currency translation adjustment | 1,792 |  |  |  | 1,792 |
Exercise of stock options | 9,219 | $ 7 | 9,212 |  |  |
Exercise of stock options (in shares) |  | 700,000 |  |  |  |
Vesting of restricted stock units |  | $ 8 | (8) |  |  |
Vesting of restricted stock units (in shares) |  | 777,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (2,000) |  |  |  |
Stock-based compensation | 20,388 |  | 20,388 |  |  |
Payment of cash dividends | (16,843) |  |  | (16,843) |  |
Dividend equivalents | (236) |  |  | (236) |  |
Purchase of treasury stock | (163,371) |  |  |  |  | (163,371)
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 |  |  |  |
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 |  |  |  |
Vesting of restricted stock units |  | $ 8 | (8) |  |  |
Vesting of restricted stock units (in shares) |  | 739,000 |  |  |  |
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 |  |  |  |
Beginning Balance at Dec. 31, 2019 | $ 2,833,620 | $ 2,694 | 2,875,680 | 1,294,902 | 5,478 | (1,345,134)
Beginning Balance (in shares) at Dec. 31, 2019 | 269,372,257 | 269,372,000 |  |  |  |
Net loss | $ (434,722) |  |  | (434,722) |  |
Foreign currency translation adjustment | (1,386) |  |  |  | (1,386) |
Vesting of restricted stock units |  | $ 1 | (1) |  |  |
Vesting of restricted stock units (in shares) |  | 151,000 |  |  |  |
Stock-based compensation | 9,160 |  | 9,160 |  |  |
Payment of cash dividends | (7,629) |  |  | (7,629) |  |
Dividend equivalents | (125) |  |  | (125) |  |
Purchase of treasury stock | (20,025) |  |  |  |  | (20,025)
Ending Balance at Mar. 31, 2020 | 2,378,893 | $ 2,695 | 2,884,839 | 852,426 | 4,092 | (1,365,159)
Ending Balance (in shares) at Mar. 31, 2020 |  | 269,523,000 |  |  |  |
Beginning Balance at Dec. 31, 2019 | $ 2,833,620 | $ 2,694 | 2,875,680 | 1,294,902 | 5,478 | (1,345,134)
Beginning Balance (in shares) at Dec. 31, 2019 | 269,372,257 | 269,372,000 |  |  |  |
Net loss | $ (585,054) |  |  | (585,054) |  |
Foreign currency translation adjustment | (691) |  |  |  | (691) |
Vesting of restricted stock units |  | $ 12 | (12) |  |  |
Vesting of restricted stock units (in shares) |  | 1,197,000 |  |  |  |
Stock-based compensation | 13,495 |  | 13,495 |  |  |
Payment of cash dividends | (11,364) |  |  | (11,364) |  |
Dividend equivalents | (198) |  |  | (198) |  |
Purchase of treasury stock | (20,935) |  |  |  |  | (20,935)
Ending Balance at Jun. 30, 2020 | $ 2,228,873 | $ 2,706 | 2,889,163 | 698,286 | 4,787 | (1,366,069)
Ending Balance (in shares) at Jun. 30, 2020 | 270,569,043 | 270,569,000 |  |  |  |
Beginning Balance at Mar. 31, 2020 | $ 2,378,893 | $ 2,695 | 2,884,839 | 852,426 | 4,092 | (1,365,159)
Beginning Balance (in shares) at Mar. 31, 2020 |  | 269,523,000 |  |  |  |
Net loss | (150,332) |  |  | (150,332) |  |
Foreign currency translation adjustment | 695 |  |  |  | 695 |
Vesting of restricted stock units |  | $ 11 | (11) |  |  |
Vesting of restricted stock units (in shares) |  | 1,046,000 |  |  |  |
Stock-based compensation | 4,335 |  | 4,335 |  |  |
Payment of cash dividends | (3,735) |  |  | (3,735) |  |
Dividend equivalents | (73) |  |  | (73) |  |
Purchase of treasury stock | (910) |  |  |  |  | (910)
Ending Balance at Jun. 30, 2020 | $ 2,228,873 | $ 2,706 | $ 2,889,163 | $ 698,286 | $ 4,787 | $ (1,366,069)
Ending Balance (in shares) at Jun. 30, 2020 | 270,569,043 | 270,569,000 |  |  |  |

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
Name: | us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration