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Consolidated Statements of Changes in Common Stockholders' Equity - USD ($) $ in Thousands | Total | Parent [Member] | Common Stock | Treasury Stock | Additional Paid-in Capital | Retained Earnings/(Deficit) | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | ---
Cumulative effect of adopting accounting standard update |  |  |  |  | $ 756 | $ (491) | $ 0
Balance, at Dec. 31, 2016 |  |  | $ 232 | $ (893,332) | 2,779,891 | 997,890 | (12,395)
Issuance of common stock under incentive and benefit plans |  |  | 1 |  | 8,635 |  |
Stock-based compensation |  |  |  |  | 13,491 |  |
Impact of extinguishment of convertible senior notes (Note 12) |  |  |  |  | (52,700) |  |
Termination of capped calls (Note 12) |  |  |  |  | 4,208 |  |
Shares repurchased under share repurchase program (Note 14) |  |  | 0 |  | (6) |  |
Repurchases of common stock under incentive plans |  |  |  | (556) |  |  |
Net income | $ 121,088 |  |  |  |  | 121,088 |
Dividends declared |  |  |  |  |  | (2,154) |
Net unrealized gains (losses) on investments, net of tax | 34,545 |  |  |  |  |  | 34,545
Net foreign currency translation adjustment, net of tax | 871 |  |  |  |  |  | 871
Net actuarial gains (losses) | 64 |  |  |  |  |  | 64
Balance, at Dec. 31, 2017 |  | $ 3,000,038 | 233 | (893,888) | 2,754,275 | 1,116,333 | 23,085
Cumulative effect of adopting accounting standard update |  |  |  |  | 0 | (663) | 2,948
Issuance of common stock under incentive and benefit plans |  |  | 1 |  | 2,859 |  |
Stock-based compensation |  |  |  |  | 17,649 |  |
Impact of extinguishment of convertible senior notes (Note 12) |  |  |  |  | 0 |  |
Termination of capped calls (Note 12) |  |  |  |  | 0 |  |
Shares repurchased under share repurchase program (Note 14) |  |  | (3) |  | (50,050) |  |
Repurchases of common stock under incentive plans |  |  |  | (982) |  |  |
Net income | 606,011 |  |  |  |  | 606,011 |
Dividends declared |  |  |  |  |  | (2,140) |
Net unrealized gains (losses) on investments, net of tax | (87,086) |  |  |  |  |  | (87,086)
Net foreign currency translation adjustment, net of tax | 4 |  |  |  |  |  | 4
Net actuarial gains (losses) | 129 |  |  |  |  |  | 129
Balance, at Dec. 31, 2018 | 3,488,715 | 3,488,715 | 231 | (894,870) | 2,724,733 | 1,719,541 | (60,920)
Cumulative effect of adopting accounting standard update |  |  |  |  | 0 | 0 | 0
Issuance of common stock under incentive and benefit plans |  |  | 1 |  | 3,925 |  |
Stock-based compensation |  |  |  |  | 21,414 |  |
Impact of extinguishment of convertible senior notes (Note 12) |  |  |  |  | 0 |  |
Termination of capped calls (Note 12) |  |  |  |  | 0 |  |
Shares repurchased under share repurchase program (Note 14) |  |  | (13) |  | (300,188) |  |
Repurchases of common stock under incentive plans |  |  |  | (6,787) |  |  |
Net income | 672,309 |  |  |  |  | 672,309 |
Dividends declared |  |  |  |  |  | (2,061) |
Net unrealized gains (losses) on investments, net of tax | 171,544 |  |  |  |  |  | 171,544
Net foreign currency translation adjustment, net of tax | (3) |  |  |  |  |  | (3)
Net actuarial gains (losses) | (133) |  |  |  |  |  | (133)
Balance, at Dec. 31, 2019 | $ 4,048,723 | $ 4,048,723 | $ 219 | $ (901,657) | $ 2,449,884 | $ 2,389,789 | $ 110,488

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