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Consolidated Statements of Changes in Equity Statement - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Loss | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 1,232,842 | $ 1,198 | $ 1,104,264 | $ (391,551) | $ 669,805 | $ (151,043) | $ 169
Balance, shares at Dec. 31, 2018 |  | 51,819,998 |  |  |  |  |
Other comprehensive loss | (16,185) |  |  |  |  | (16,156) | (29)
Stock issued under employee stock plans | 3,441 | $ 3 | 5,194 | (1,756) |  |  |
Stock issued under employee stock plans, shares |  | 130,136 |  |  |  |  |
Share-based compensation | 4,490 |  | 4,490 |  |  |  |
Issuance of convertible notes, net of tax | 71,660 |  | 71,660 |  |  |  |
Redemptions and conversions of convertible notes, net of tax | (42,917) |  | (42,917) |  |  |  |
Redemptions and conversions of convertible notes, net of tax, shares |  | 6 |  |  |  |  |
Net (loss) income | 34,579 |  |  |  | 34,543 |  | 36
Balance at Mar. 31, 2019 | 1,287,910 | $ 1,201 | 1,142,691 | (393,307) | 704,348 | (167,199) | 176
Balance, shares at Mar. 31, 2019 |  | 51,950,140 |  |  |  |  |
Balance at Dec. 31, 2018 | 1,232,842 | $ 1,198 | 1,104,264 | (391,551) | 669,805 | (151,043) | 169
Balance, shares at Dec. 31, 2018 |  | 51,819,998 |  |  |  |  |
Net (loss) income | 240,125 |  |  |  |  |  |
Balance at Sep. 30, 2019 | 1,445,552 | $ 1,252 | 1,179,413 | (433,282) | 910,108 | (211,853) | (86)
Balance, shares at Sep. 30, 2019 |  | 54,240,495 |  |  |  |  |
Balance at Mar. 31, 2019 | 1,287,910 | $ 1,201 | 1,142,691 | (393,307) | 704,348 | (167,199) | 176
Balance, shares at Mar. 31, 2019 |  | 51,950,140 |  |  |  |  |
Other comprehensive loss | 12,161 |  |  |  |  | 12,149 | 12
Stock issued under employee stock plans | 1,694 |  | 1,740 | (46) |  |  |
Stock issued under employee stock plans, shares |  | 41,856 |  |  |  |  |
Share-based compensation | 6,003 |  | 6,003 |  |  |  |
Redemptions and conversions of convertible notes, net of tax | 22,450 | $ 50 | 22,400 |  |  |  |
Redemptions and conversions of convertible notes, net of tax, shares |  | 2,488,243 |  |  |  |  |
Net (loss) income | 68,005 |  |  |  | 68,153 |  | (148)
Balance at Jun. 30, 2019 | 1,398,223 | $ 1,251 | 1,172,834 | (393,353) | 772,501 | (155,050) | 40
Balance, shares at Jun. 30, 2019 |  | 54,480,239 |  |  |  |  |
Other comprehensive loss | (56,863) |  |  |  |  | (56,803) | (60)
Stock issued under employee stock plans | 954 | $ 1 | 1,131 | (178) |  |  |
Stock issued under employee stock plans, shares |  | 35,437 |  |  |  |  |
Share-based compensation | 5,456 |  | 5,456 |  |  |  |
Repurchase of shares | (39,751) |  |  | (39,751) |  |  |
Repurchase of shares, shares |  | (275,181) |  |  |  |  |
Other | (8) |  | (8) |  |  |  |
Net (loss) income | 137,541 |  |  |  | 137,607 |  | (66)
Balance at Sep. 30, 2019 | 1,445,552 | $ 1,252 | 1,179,413 | (433,282) | 910,108 | (211,853) | (86)
Balance, shares at Sep. 30, 2019 |  | 54,240,495 |  |  |  |  |
Balance at Dec. 31, 2019 | 1,579,342 | $ 1,256 | 1,190,058 | (463,704) | 1,016,554 | (164,890) | 68
Balance, shares at Dec. 31, 2019 |  | 54,220,854 |  |  |  |  |
Other comprehensive loss | (59,818) |  |  |  |  | (59,777) | (41)
Stock issued under employee stock plans | 1,453 | $ 1 | 1,701 | (249) |  |  |
Stock issued under employee stock plans, shares |  | 80,519 |  |  |  |  |
Share-based compensation | 6,338 |  | 6,338 |  |  |  |
Repurchase of shares | (239,763) |  |  | (239,763) |  |  |
Repurchase of shares, shares |  | 2,095,683 |  |  |  |  |
Net (loss) income | 1,720 |  |  |  | 1,921 |  | (201)
Balance at Mar. 31, 2020 | 1,289,272 | $ 1,257 | 1,198,097 | (703,716) | 1,018,475 | (224,667) | (174)
Balance, shares at Mar. 31, 2020 |  | 52,205,690 |  |  |  |  |
Balance at Dec. 31, 2019 | 1,579,342 | $ 1,256 | 1,190,058 | (463,704) | 1,016,554 | (164,890) | 68
Balance, shares at Dec. 31, 2019 |  | 54,220,854 |  |  |  |  |
Net (loss) income | (73,698) |  |  |  |  |  |
Balance at Sep. 30, 2020 | 1,305,758 | $ 1,259 | 1,210,709 | (703,604) | 942,920 | (145,583) | 57
Balance, shares at Sep. 30, 2020 |  | 52,310,135 |  |  |  |  |
Balance at Mar. 31, 2020 | 1,289,272 | $ 1,257 | 1,198,097 | (703,716) | 1,018,475 | (224,667) | (174)
Balance, shares at Mar. 31, 2020 |  | 52,205,690 |  |  |  |  |
Other comprehensive loss | 32,172 |  |  |  |  | 32,145 | 27
Stock issued under employee stock plans | 3,824 | $ 2 | 3,763 | 59 |  |  |
Stock issued under employee stock plans, shares |  | 82,841 |  |  |  |  |
Share-based compensation | 3,125 |  | 3,125 |  |  |  |
Net (loss) income | (115,733) |  |  |  | (115,804) |  | 71
Balance at Jun. 30, 2020 | 1,212,660 | $ 1,259 | 1,204,985 | (703,657) | 902,671 | (192,522) | (76)
Balance, shares at Jun. 30, 2020 |  | 52,288,531 |  |  |  |  |
Other comprehensive loss | 47,006 |  |  |  |  | 46,939 | 67
Stock issued under employee stock plans | 740 |  | 687 | 53 |  |  |
Stock issued under employee stock plans, shares |  | 21,604 |  |  |  |  |
Share-based compensation | 5,037 |  | 5,037 |  |  |  |
Net (loss) income | 40,315 |  |  |  | 40,249 |  | 66
Balance at Sep. 30, 2020 | $ 1,305,758 | $ 1,259 | $ 1,210,709 | $ (703,604) | $ 942,920 | $ (145,583) | $ 57
Balance, shares at Sep. 30, 2020 |  | 52,310,135 |  |  |  |  |

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