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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) | ASU 2016-09 Additional Paid-in Capital | ASU 2016-09 Retained Earnings | ASU 2016-01 Retained Earnings | ASU 2016-01 Accumulated Other Comprehensive Income (Loss) | ASU 2018-02 Retained Earnings | ASU 2018-02 Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of adopting accounting standard update |  |  |  |  |  |  |  | $ 756 | $ (491) | $ 0 | $ 0 | $ 0 | $ 0
Balance, beginning of period at Dec. 31, 2016 |  |  | $ 232 | $ (893,332) | $ 2,779,891 | $ 997,890 | $ (12,395) |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  | 1 |  |  |  |  |  |  |  |  |  |
Shares repurchased under share repurchase program (Note 14) |  |  | 0 |  | (6) |  |  |  |  |  |  |  |
Repurchases of common stock under incentive plans |  |  |  | (422) |  |  |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 4,761 |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  | 10,290 |  |  |  |  |  |  |  |
Impact of extinguishment of convertible senior notes |  |  |  |  | (52,408) |  |  |  |  |  |  |  |
Termination of capped calls |  |  |  |  | 4,109 |  |  |  |  |  |  |  |
Net income | $ 114,272 |  |  |  |  | 114,272 |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  | (1,614) |  |  |  |  |  |  |
Net unrealized gains (losses) on investments, net of tax | 36,532 |  |  |  |  |  | 36,532 |  |  |  |  |  |
Net foreign currency translation adjustment, net of tax | 136 |  |  |  |  |  | 136 |  |  |  |  |  |
Balance, end of period at Sep. 30, 2017 |  | $ 2,988,202 | 233 | (893,754) | 2,747,393 | 1,110,057 | 24,273 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of adopting accounting standard update |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 2,061 | $ 224 | $ (2,724) | $ 2,724
Balance, beginning of period at Dec. 31, 2017 | 3,000,038 |  | 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 14) |  |  | (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 |  |  |  |  |  |  |  |
Impact of extinguishment of convertible senior notes |  |  |  |  | 0 |  |  |  |  |  |  |  |
Termination of capped calls |  |  |  |  | 0 |  |  |  |  |  |  |  |
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 | $ 3,347,278 | $ 231 | $ (894,635) | $ 2,720,626 | $ 1,580,296 | $ (59,240) |  |  |  |  |  |

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- Definition The change in APIC related to the activity with convertible debt redemption or extinguishment by induced conversion. The amount includes the adjustment to the equity component of the convertible debt, any tax adjustments, as well as the impact based on how the redemption/extinguishment is settled (cash or equity). If settled in equity, the increase (decrease) will include the adjustment to APIC related to the shares used to settle the debt. + References No definition available. + Details
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