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v3.20.1

Condensed Consolidated Statements of Changes in Common Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Parent | Common Stock | Treasury Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2018 |  |  | $ 231 | $ (894,870) | $ 2,724,733 | $ 1,719,541 | $ (60,920)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Shares repurchased under share repurchase program (Note 13) |  |  | (1) |  | (31,773) |  |
Repurchases of common stock under incentive plans |  |  |  | (451) |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 1,069 |  |
Share-based compensation |  |  |  |  | 3,695 |  |
Net income | $ 170,957 |  |  |  |  | 170,957 |
Dividends and dividend equivalents declared |  |  |  |  |  | (534) |
Net unrealized gains (losses) on investments, net of tax | 78,414 |  |  |  |  |  | 78,414
Balance, end of period at Mar. 31, 2019 |  | $ 3,710,091 | 230 | (895,321) | 2,697,724 | 1,889,964 | 17,494
Balance, beginning of period at Dec. 31, 2019 | 4,048,723 |  | 219 | (901,657) | 2,449,884 | 2,389,789 | 110,488
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Shares repurchased under share repurchase program (Note 13) |  |  | (11) |  | (226,294) |  |
Repurchases of common stock under incentive plans |  |  |  | (367) |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 2,235 |  |
Share-based compensation |  |  |  |  | 5,845 |  |
Net income | 140,461 |  |  |  |  | 140,461 |
Dividends and dividend equivalents declared |  |  |  |  |  | (25,397) |
Net unrealized gains (losses) on investments, net of tax | (80,687) |  |  |  |  |  | (80,687)
Balance, end of period at Mar. 31, 2020 | $ 3,864,508 | $ 3,864,508 | $ 208 | $ (902,024) | $ 2,231,670 | $ 2,504,853 | $ 29,801

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