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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
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2015 |  |  | $ 224 | $ (893,176) | $ 2,716,618 | $ 691,742 | $ (18,477)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Impact to common stock related to extinguishment of Convertible Senior Notes |  |  | 17 |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  | 0 |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | (9) |  | (100,179) |  |
Share-based compensation |  |  |  |  | 14,428 |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 726 |  |
Impact of extinguishment of Convertible Senior Notes due 2017 and 2019 (Note 11) |  |  |  |  | 149,543 |  |
Equity Impact of Termination of Capped Call Transaction |  |  |  |  | 0 |  |
Change in equity component of currently redeemable convertible senior notes |  |  |  |  | 0 |  |
Repurchases of common stock under incentive plans |  |  |  | 0 |  |  |
Net income (loss) | $ 164,361 |  |  |  |  | 164,361 |
Dividends declared |  |  |  |  |  | (1,033) |
Net foreign currency translation adjustment, net of tax | (310) |  |  |  |  |  | (310)
Net unrealized gains (losses) on investments, net of tax | 81,070 |  |  |  |  |  | 81,070
Net actuarial gains (losses) | (178) |  |  |  |  |  | (178)
Balance, end of period at Jun. 30, 2016 |  | $ 2,805,367 | 232 | (893,176) | 2,781,136 | 855,070 | 62,105
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of adoption of the accounting standard update for share-based payment transactions |  |  |  |  | 0 | 0 |
Balance, beginning of period at Dec. 31, 2016 | 2,872,286 |  | 232 | (893,332) | 2,779,891 | 997,890 | (12,395)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Impact to common stock related to extinguishment of Convertible Senior Notes |  |  | 0 |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  | 1 |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | 0 |  | (6) |  |
Share-based compensation |  |  |  |  | 7,676 |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 3,840 |  |
Impact of extinguishment of Convertible Senior Notes due 2017 and 2019 (Note 11) |  |  |  |  | (52,352) |  |
Equity Impact of Termination of Capped Call Transaction |  |  |  |  | 4,083 |  |
Change in equity component of currently redeemable convertible senior notes |  |  |  |  | (16) |  |
Repurchases of common stock under incentive plans |  |  |  | (199) |  |  |
Net income (loss) | 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
Net actuarial gains (losses) | 0 |  |  |  |  |  | 0
Balance, end of period at Jun. 30, 2017 | $ 2,914,144 | $ 2,914,144 | $ 233 | $ (893,531) | 2,743,872 | 1,045,453 | $ 18,117
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of adoption of the accounting standard update for share-based payment transactions |  |  |  |  | $ 756 | $ (491) |

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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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- Definition The equity impact of the termination of a capped call transaction as it relates to shares received by the entity and the impact to additional paid-in capital for other proceeds received in conjunction with the terminated transaction. + References No definition available. + Details
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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,c) -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition The net amount of stock issued during the period upon the conversion of convertible securities, net of adjustments (for example, to additional paid in capital) including the write-off of an equity component recognized to record the convertible debt instrument as two separate components - a debt component and an equity component. This item is meant to disclose the value of shares issued on conversion of convertible securities that were recorded as two separate (debt and equity) components. + References No definition available. + Details
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- Definition Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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