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Unaudited Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Stockholders' Equity beginning balance at Dec. 31, 2019 | $ 3,711,616 | $ 124 | $ 2,494,721 | $ 4,712,729 | $ (972,465) | $ (2,523,493)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 147,060 |  |  | 147,060 |  |
Other comprehensive loss, net of tax | (619,659) |  |  |  | (619,659) |
Acquisition of common stock | (530,237) |  | 75,000 |  |  | (605,237)
Share-based compensation | 14,175 |  | 14,175 |  |  |
Issuance of common stock | 73,274 | 1 | 73,273 |  |  |
Stockholders' Equity ending balance at Mar. 31, 2020 | 2,796,229 | 125 | 2,657,169 | 4,859,789 | (1,592,124) | (3,128,730)
Stockholders' Equity beginning balance at Dec. 31, 2019 | 3,711,616 | 124 | 2,494,721 | 4,712,729 | (972,465) | (2,523,493)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 494,365 |  |  |  |  |
Other comprehensive loss, net of tax | (610,671) |  |  |  |  |
Stockholders' Equity ending balance at Sep. 30, 2020 | 2,937,750 | 126 | 2,713,022 | 5,207,094 | (1,583,136) | (3,399,356)
Stockholders' Equity beginning balance at Mar. 31, 2020 | 2,796,229 | 125 | 2,657,169 | 4,859,789 | (1,592,124) | (3,128,730)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 158,488 |  |  | 158,488 |  |
Other comprehensive loss, net of tax | 10,149 |  |  |  | 10,149 |
Acquisition of common stock | (32,230) |  |  |  |  | (32,230)
Share-based compensation | 8,989 |  | 8,989 |  |  |
Issuance of common stock | 24,809 | 1 | 24,808 |  |  |
Stockholders' Equity ending balance at Jun. 30, 2020 | 2,966,434 | 126 | 2,690,966 | 5,018,277 | (1,581,975) | (3,160,960)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 188,817 |  |  | 188,817 |  |
Other comprehensive loss, net of tax | (1,161) |  |  |  | (1,161) |
Acquisition of common stock | (238,396) |  |  |  |  | (238,396)
Share-based compensation | 11,905 |  | 11,905 |  |  |
Issuance of common stock | 10,151 |  | 10,151 |  |  |
Stockholders' Equity ending balance at Sep. 30, 2020 | 2,937,750 | 126 | 2,713,022 | 5,207,094 | (1,583,136) | (3,399,356)
Stockholders' Equity beginning balance at Dec. 31, 2020 | 3,355,411 | 126 | 2,749,900 | 5,416,945 | (1,363,158) | (3,448,402)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 184,239 |  |  | 184,239 |  |
Other comprehensive loss, net of tax | (117,861) |  |  |  | (117,861) |
Acquisition of common stock | (170,382) |  |  |  |  | (170,382)
Share-based compensation | 17,747 |  | 17,747 |  |  |
Issuance of common stock | 27,345 | 1 | 27,344 |  |  |
Stockholders' Equity ending balance at Mar. 31, 2021 | 3,296,499 | 127 | 2,794,991 | 5,601,184 | (1,481,019) | (3,618,784)
Stockholders' Equity beginning balance at Dec. 31, 2020 | 3,355,411 | 126 | 2,749,900 | 5,416,945 | (1,363,158) | (3,448,402)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 614,493 |  |  |  |  |
Other comprehensive loss, net of tax | (72,886) |  |  |  |  |
Stockholders' Equity ending balance at Sep. 30, 2021 | 3,174,985 | 127 | 2,850,143 | 6,031,438 | (1,436,044) | (4,270,679)
Stockholders' Equity beginning balance at Mar. 31, 2021 | 3,296,499 | 127 | 2,794,991 | 5,601,184 | (1,481,019) | (3,618,784)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 196,247 |  |  | 196,247 |  |
Other comprehensive loss, net of tax | 215,842 |  |  |  | 215,842 |
Acquisition of common stock | (246,203) |  |  |  |  | (246,203)
Share-based compensation | 17,885 |  | 17,885 |  |  |
Issuance of common stock | 8,577 |  | 8,577 |  |  |
Stockholders' Equity ending balance at Jun. 30, 2021 | 3,488,847 | 127 | 2,821,453 | 5,797,431 | (1,265,177) | (3,864,987)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 234,007 |  |  | 234,007 |  |
Other comprehensive loss, net of tax | (170,867) |  |  |  | (170,867) |
Acquisition of common stock | (405,692) |  |  |  |  | (405,692)
Share-based compensation | 16,453 |  | 16,453 |  |  |
Issuance of common stock | 12,237 |  | 12,237 |  |  |
Stockholders' Equity ending balance at Sep. 30, 2021 | $ 3,174,985 | $ 127 | $ 2,850,143 | $ 6,031,438 | $ (1,436,044) | $ (4,270,679)

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