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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 |  |  |  | (40) |  |  |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 3,548 |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  | 3,222 |  |  |  |  |  |  |  |
Impact of extinguishment of convertible senior notes |  |  |  |  | (42,940) |  |  |  |  |  |  |  |
Change in equity component of currently redeemable convertible senior notes |  |  |  |  | (883) |  |  |  |  |  |  |  |
Shares repurchased under share repurchase program (Note 14) |  |  |  |  | 0 |  |  |  |  |  |  |  |
Net income | $ 76,472 |  |  |  |  | 76,472 |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  | (538) |  |  |  |  |  |  |
Net foreign currency translation adjustment, net of tax | 34 |  |  |  |  |  | 34 |  |  |  |  |  |
Net unrealized gains (losses) on investments, net of tax | 8,998 |  |  |  |  |  | 8,998 |  |  |  |  |  |
Balance, end of period at Mar. 31, 2017 |  | $ 2,920,425 | 233 | (893,372) | 2,743,594 | 1,073,333 | (3,363) |  |  |  |  |  |
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 |  |  | 0 |  |  |  |  |  |  |  |  |  |
Repurchases of common stock under incentive plans |  |  |  | (303) |  |  |  |  |  |  |  |  |
Issuance of common stock under incentive and benefit plans |  |  |  |  | 1,433 |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  | 2,528 |  |  |  |  |  |  |  |
Impact of extinguishment of convertible senior notes |  |  |  |  | 0 |  |  |  |  |  |  |  |
Change in equity component of currently redeemable convertible senior notes |  |  |  |  | 0 |  |  |  |  |  |  |  |
Shares repurchased under share repurchase program (Note 14) |  |  |  |  | (10,003) |  |  |  |  |  |  |  |
Net income | 114,486 |  |  |  |  | 114,486 |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  | (540) |  |  |  |  |  |  |
Net foreign currency translation adjustment, net of tax | 3 |  |  |  |  |  | 3 |  |  |  |  |  |
Net unrealized gains (losses) on investments, net of tax | (57,511) |  |  |  |  |  | (57,511) |  |  |  |  |  |
Balance, end of period at Mar. 31, 2018 | $ 3,052,416 | $ 3,052,416 | $ 233 | $ (894,191) | $ 2,748,233 | $ 1,229,616 | $ (31,475) |  |  |  |  |  |
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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- 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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