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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 | Accounting Standards Update 2016-01 [Member] Retained Earnings | Accounting Standards Update 2016-01 [Member] Accumulated Other Comprehensive Income | Accounting Standards Update 2018-02 [Member] Retained Earnings | Accounting Standards Update 2018-02 [Member] Accumulated Other Comprehensive Income | Accounting Standards Update 2016-09 [Member] Additional Paid-in Capital | Accounting Standards Update 2016-09 [Member] Retained Earnings
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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 |  |  |  |  |  |  |  |  |  |
Repurchases of common stock under incentive plans |  |  |  | (199) |  |  |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 3,840 |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  | 7,676 |  |  |  |  |  |  |  |
Impact of extinguishment of convertible senior notes |  |  |  |  | (52,352) |  |  |  |  |  |  |  |
Equity Impact of Termination of Capped Call Transaction |  |  |  |  | 4,083 |  |  |  |  |  |  |  |
Change in equity component of currently redeemable convertible senior notes |  |  |  |  | (16) |  |  |  |  |  |  |  |
Shares repurchased under share repurchase program (Note 14) |  |  | 0 |  | (6) |  |  |  |  |  |  |  |
Net income | $ 49,130 |  |  |  |  | 49,130 |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  | (1,076) |  |  |  |  |  |  |
Net foreign currency translation adjustment, net of tax | 108 |  |  |  |  |  | 108 |  |  |  |  |  |
Net unrealized gains (losses) on investments, net of tax | 30,404 |  |  |  |  |  | 30,404 |  |  |  |  |  |
Balance, end of period at Jun. 30, 2017 |  | $ 2,914,144 | 233 | (893,531) | 2,743,872 | 1,045,453 | 18,117 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 756 | $ (491)
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 |  |  |  |  |  |  |  |  |  |
Repurchases of common stock under incentive plans |  |  |  | (722) |  |  |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 1,579 |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  | 9,622 |  |  |  |  |  |  |  |
Impact of extinguishment of convertible senior notes |  |  |  |  | 0 |  |  |  |  |  |  |  |
Equity Impact of Termination of Capped Call Transaction |  |  |  |  | 0 |  |  |  |  |  |  |  |
Change in equity component of currently redeemable convertible senior notes |  |  |  |  | 0 |  |  |  |  |  |  |  |
Shares repurchased under share repurchase program (Note 14) |  |  | (3) |  | (50,050) |  |  |  |  |  |  |  |
Net income | 323,435 |  |  |  |  | 323,435 |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  | (1,073) |  |  |  |  |  |  |
Net foreign currency translation adjustment, net of tax | 3 |  |  |  |  |  | 3 |  |  |  |  |  |
Net unrealized gains (losses) on investments, net of tax | (83,979) |  |  |  |  |  | (83,979) |  |  |  |  |  |
Balance, end of period at Jun. 30, 2018 | $ 3,201,136 | $ 3,201,136 | $ 231 | $ (894,610) | $ 2,715,426 | $ 1,438,032 | $ (57,943) |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  | $ 2,061 | $ 224 | $ (2,724) | $ 2,724 | $ 0 | $ 0

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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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