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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)
--- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of adopting accounting standard updates |  |  |  |  |  | $ (663) | $ 2,948
Balance, beginning of period at Dec. 31, 2017 |  |  | $ 233 | $ (893,888) | $ 2,754,275 | 1,116,333 | 23,085
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) |  |  | (3) |  | (50,050) |  |
Repurchases of common stock under incentive plans |  |  |  | (747) |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 2,593 |  |
Share-based compensation |  |  |  |  | 13,808 |  |
Net income | $ 466,232 |  |  |  |  | 466,232 |
Dividends declared |  |  |  |  |  | (1,606) |
Net unrealized gains (losses) on investments, net of tax | (85,276) |  |  |  |  |  | (85,276)
Net foreign currency translation adjustment, net of tax | 3 |  |  |  |  |  | 3
Balance, end of period at Sep. 30, 2018 |  | $ 3,347,278 | 231 | (894,635) | 2,720,626 | 1,580,296 | (59,240)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of adopting accounting standard updates |  |  |  |  |  | 0 | 0
Balance, beginning of period at Jun. 30, 2018 |  |  | 231 | (894,610) | 2,715,426 | 1,438,032 | (57,943)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  | 0 |  |  |  |
Shares repurchased under share repurchase program (Note 13) |  |  | 0 |  | 0 |  |
Repurchases of common stock under incentive plans |  |  |  | (25) |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 1,014 |  |
Share-based compensation |  |  |  |  | 4,186 |  |
Net income | 142,797 |  |  |  |  | 142,797 |
Dividends declared |  |  |  |  |  | (533) |
Net unrealized gains (losses) on investments, net of tax | (1,297) |  |  |  |  |  | (1,297)
Net foreign currency translation adjustment, net of tax | 0 |  |  |  |  |  | 0
Balance, end of period at Sep. 30, 2018 |  | 3,347,278 | 231 | (894,635) | 2,720,626 | 1,580,296 | (59,240)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of adopting accounting standard updates |  |  |  |  |  | 0 | 0
Balance, beginning of period at Dec. 31, 2018 | 3,488,715 |  | 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) |  |  | (12) |  | (275,173) |  |
Repurchases of common stock under incentive plans |  |  |  | (6,686) |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 4,418 |  |
Share-based compensation |  |  |  |  | 15,119 |  |
Net income | 511,125 |  |  |  |  | 511,125 |
Dividends declared |  |  |  |  |  | (1,559) |
Net unrealized gains (losses) on investments, net of tax | 186,562 |  |  |  |  |  | 186,562
Net foreign currency translation adjustment, net of tax | (3) |  |  |  |  |  | (3)
Balance, end of period at Sep. 30, 2019 | 3,922,507 | 3,922,507 | 220 | (901,556) | 2,469,097 | 2,229,107 | 125,639
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of adopting accounting standard updates |  |  |  |  |  | 0 | 0
Balance, beginning of period at Jun. 30, 2019 |  |  | 223 | (901,419) | 2,539,803 | 2,056,175 | 88,462
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  | 0 |  |  |  |
Shares repurchased under share repurchase program (Note 13) |  |  | (3) |  | (77,535) |  |
Repurchases of common stock under incentive plans |  |  |  | (137) |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 1,660 |  |
Share-based compensation |  |  |  |  | 5,169 |  |
Net income | 173,438 |  |  |  |  | 173,438 |
Dividends declared |  |  |  |  |  | (506) |
Net unrealized gains (losses) on investments, net of tax | 37,177 |  |  |  |  |  | 37,177
Net foreign currency translation adjustment, net of tax | 0 |  |  |  |  |  | 0
Balance, end of period at Sep. 30, 2019 | $ 3,922,507 | $ 3,922,507 | $ 220 | $ (901,556) | $ 2,469,097 | $ 2,229,107 | $ 125,639

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