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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, 2018 |  |  | $ 231 | $ (894,870) | $ 2,724,733 | $ 1,719,541 | $ (60,920)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  | 1 |  |  |  |
Shares repurchased under share repurchase program (Note 13) |  |  | (9) |  | (197,638) |  |
Repurchases of common stock under incentive plans |  |  |  | (6,549) |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 2,758 |  |
Share-based compensation |  |  |  |  | 9,950 |  |
Net income (loss) | $ 337,687 |  |  |  |  | 337,687 |
Dividends and dividend equivalents declared |  |  |  |  |  | (1,053) |
Net unrealized gains (losses) on investments, net of tax | 149,385 |  |  |  |  |  | 149,385
Net foreign currency translation adjustment, net of tax | (3) |  |  |  |  |  | (3)
Balance, end of period at Jun. 30, 2019 |  | $ 3,783,244 | 223 | (901,419) | 2,539,803 | 2,056,175 | 88,462
Balance, beginning of period at Mar. 31, 2019 |  |  | 230 | (895,321) | 2,697,724 | 1,889,964 | 17,494
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  | 1 |  |  |  |
Shares repurchased under share repurchase program (Note 13) |  |  | (8) |  | (165,865) |  |
Repurchases of common stock under incentive plans |  |  |  | (6,098) |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 1,689 |  |
Share-based compensation |  |  |  |  | 6,255 |  |
Net income (loss) | 166,730 |  |  |  |  | 166,730 |
Dividends and dividend equivalents declared |  |  |  |  |  | (519) |
Net unrealized gains (losses) on investments, net of tax | 70,971 |  |  |  |  |  | 70,971
Net foreign currency translation adjustment, net of tax | (3) |  |  |  |  |  | (3)
Balance, end of period at Jun. 30, 2019 |  | 3,783,244 | 223 | (901,419) | 2,539,803 | 2,056,175 | 88,462
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] |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  | 2 |  |  |  |
Shares repurchased under share repurchase program (Note 13) |  |  | (11) |  | (226,294) |  |
Repurchases of common stock under incentive plans |  |  |  | (8,081) |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 2,271 |  |
Share-based compensation |  |  |  |  | 7,088 |  |
Net income (loss) | 110,510 |  |  |  |  | 110,510 |
Dividends and dividend equivalents declared |  |  |  |  |  | (49,876) |
Net unrealized gains (losses) on investments, net of tax | 101,673 |  |  |  |  |  | 101,673
Net foreign currency translation adjustment, net of tax | 0 |  |  |  |  |  | 0
Balance, end of period at Jun. 30, 2020 | 3,986,005 | 3,986,005 | 210 | (909,738) | 2,232,949 | 2,450,423 | 212,161
Balance, beginning of period at Mar. 31, 2020 |  |  | 208 | (902,024) | 2,231,670 | 2,504,853 | 29,801
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  | 2 |  |  |  |
Shares repurchased under share repurchase program (Note 13) |  |  | 0 |  | 0 |  |
Repurchases of common stock under incentive plans |  |  |  | (7,714) |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 36 |  |
Share-based compensation |  |  |  |  | 1,243 |  |
Net income (loss) | (29,951) |  |  |  |  | (29,951) |
Dividends and dividend equivalents declared |  |  |  |  |  | (24,479) |
Net unrealized gains (losses) on investments, net of tax | 182,360 |  |  |  |  |  | 182,360
Net foreign currency translation adjustment, net of tax | 0 |  |  |  |  |  | 0
Balance, end of period at Jun. 30, 2020 | $ 3,986,005 | $ 3,986,005 | $ 210 | $ (909,738) | $ 2,232,949 | $ 2,450,423 | $ 212,161

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