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Condensed Consolidated Statements of Changes in Common Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common stock | Treasury stock | Additional paid-in capital | Retained earnings | Accumulated other comprehensive income (loss)
--- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2022 |  | $ 176 | $ (930,643) | $ 1,519,641 | $ 3,786,952 | $ (456,799)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  | 2 |  | 2,857 |  |
Shares repurchased under share repurchase program (Note 14) |  | (1) |  | (20,008) |  |
Repurchases of common stock under incentive plans |  |  | (14,389) |  |  |
Share-based compensation |  |  |  | 20,405 |  |
Net income | $ 303,844 |  |  |  | 303,844 |
Dividends and dividend equivalents declared |  |  |  |  | (74,314) |
Net unrealized gains (losses) on investments, net of tax | 32,934 |  |  |  |  | 32,934
Other adjustments to other comprehensive income (loss) |  |  |  |  |  | 179
Balance, end of period at Jun. 30, 2023 | 4,170,836 | 177 | (945,032) | 1,522,895 | 4,016,482 | (423,686)
Balance, beginning of period at Mar. 31, 2023 |  | 176 | (931,313) | 1,515,852 | 3,908,396 | (386,633)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  | 1 |  | 752 |  |
Shares repurchased under share repurchase program (Note 14) |  | 0 |  | (4,852) |  |
Repurchases of common stock under incentive plans |  |  | (13,719) |  |  |
Share-based compensation |  |  |  | 11,143 |  |
Net income | 146,087 |  |  |  | 146,087 |
Dividends and dividend equivalents declared |  |  |  |  | (38,001) |
Net unrealized gains (losses) on investments, net of tax | (37,053) |  |  |  |  | (37,053)
Other adjustments to other comprehensive income (loss) |  |  |  |  |  | 0
Balance, end of period at Jun. 30, 2023 | 4,170,836 | 177 | (945,032) | 1,522,895 | 4,016,482 | (423,686)
Balance, beginning of period at Dec. 31, 2023 | 4,397,805 | 173 | (945,870) | 1,430,594 | 4,243,759 | (330,851)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  | 2 |  | 2,387 |  |
Shares repurchased under share repurchase program (Note 14) |  | (3) |  | (100,680) |  |
Repurchases of common stock under incentive plans |  |  | (21,348) |  |  |
Share-based compensation |  |  |  | 24,040 |  |
Net income | 304,257 |  |  |  | 304,257 |
Dividends and dividend equivalents declared |  |  |  |  | (77,681) |
Net unrealized gains (losses) on investments, net of tax | (46,392) |  |  |  |  | (46,392)
Other adjustments to other comprehensive income (loss) |  |  |  |  |  | (68)
Balance, end of period at Jun. 30, 2024 | 4,482,319 | 172 | (967,218) | 1,356,341 | 4,470,335 | (377,311)
Balance, beginning of period at Mar. 31, 2024 |  | 171 | (946,202) | 1,390,436 | 4,357,823 | (362,496)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  | 2 |  | 856 |  |
Shares repurchased under share repurchase program (Note 14) |  | (1) |  | (50,179) |  |
Repurchases of common stock under incentive plans |  |  | (21,016) |  |  |
Share-based compensation |  |  |  | 15,228 |  |
Net income | 151,903 |  |  |  | 151,903 |
Dividends and dividend equivalents declared |  |  |  |  | (39,391) |
Net unrealized gains (losses) on investments, net of tax | (14,815) |  |  |  |  | (14,815)
Other adjustments to other comprehensive income (loss) |  |  |  |  |  | 0
Balance, end of period at Jun. 30, 2024 | $ 4,482,319 | $ 172 | $ (967,218) | $ 1,356,341 | $ 4,470,335 | $ (377,311)

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