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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, 2019 |  |  | $ 219 | $ (901,657) | $ 2,449,884 | $ 2,389,789 | $ 110,488
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 2,235 |  |
Stock Repurchased During Period, Value |  |  | (11) |  | (226,294) |  |
Repurchases of common stock under incentive plans |  |  |  | (367) |  |  |
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)
Balance, end of period at Mar. 31, 2020 |  | $ 3,864,508 | 208 | (902,024) | 2,231,670 | 2,504,853 | 29,801
Balance, beginning of period at Dec. 31, 2020 | 4,284,353 |  | 210 | (910,115) | 2,245,897 | 2,684,636 | 263,725
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 1,167 |  |
Stock Repurchased During Period, Value |  |  | 0 |  | (8,637) |  |
Repurchases of common stock under incentive plans |  |  |  | (232) |  |  |
Share-based compensation |  |  |  |  | 4,523 |  |
Net income | 125,608 |  |  |  |  | 125,608 |
Dividends and dividend equivalents declared |  |  |  |  |  | (24,500) |
Net unrealized gains (losses) on investments, net of tax |  |  |  |  |  |  | (146,990)
Balance, end of period at Mar. 31, 2021 | $ 4,235,292 | $ 4,235,292 | $ 210 | $ (910,347) | $ 2,242,950 | $ 2,785,744 | $ 116,735

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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