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Convertible Debt (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Convertible Debt [Abstract] |  |  |  |  |  |  |
Repurchase of convertible notes |  |  |  |  | $ 256,963 | $ 0 |
Cost of call spread | $ 46,900 | $ 52,600 |  |  |  |  |
Purchase of note hedges | 136,700 | 108,700 |  |  | 136,620 | 0 |
Proceeds from issuance of warrants | 89,800 | $ 56,100 |  |  | 89,752 | 0 |
Loss on early retirement of debt |  |  | $ 0 | $ 0 | (8,627) | $ 0 |
0% Notes [Member] |  |  |  |  |  |  |
Convertible Debt [Abstract] |  |  |  |  |  |  |
Face amount of offering | 632,500 |  |  |  |  |  |
Outstanding principal balance |  |  | 632,500 |  | 632,500 |  |
Unamortized debt issuance costs |  |  | $ 14,200 |  | $ 14,200 |  |
Maturity date |  |  |  |  | Apr. 30, 2026 |  |
Interest rate |  |  | 0.00% |  | 0.00% |  |
Effective interest rate |  |  | 0.50% |  | 0.50% |  |
Conversion price per share (in dollars per share) |  |  | $ 57.84 |  | $ 57.84 |  |
Effective conversion price per share with call spread (in dollars per share) |  |  | $ 76.39 |  | $ 76.39 |  |
Total shares of common stock subject to conversion (in shares) |  |  | 10.9 |  | 10.9 |  |
Percentage of principal amount used as purchase price upon occurrence of fundamental change |  |  |  |  | 100.00% |  |
0.125% Notes [Member] |  |  |  |  |  |  |
Convertible Debt [Abstract] |  |  |  |  |  |  |
Outstanding principal balance |  |  | $ 548,800 |  | $ 548,800 |  |
Unamortized debt issuance costs |  |  | $ 7,100 |  | $ 7,100 |  |
Maturity date |  |  |  |  | Dec. 31, 2024 |  |
Interest rate |  |  | 0.125% | 0.125% | 0.125% | 0.125% | 0.125%
Effective interest rate |  |  | 0.50% |  | 0.50% |  |
Conversion price per share (in dollars per share) |  |  | $ 83.28 |  | $ 83.28 |  |
Effective conversion price per share with call spread (in dollars per share) |  |  | $ 123.38 |  | $ 123.38 |  |
Total shares of common stock subject to conversion (in shares) |  |  | 6.6 |  | 6.6 |  |
Percentage of principal amount used as purchase price upon occurrence of fundamental change |  |  |  |  | 100.00% |  |
1% Notes [Member] |  |  |  |  |  |  |
Convertible Debt [Abstract] |  |  |  |  |  |  |
Principal amount repurchased | 247,900 |  | $ 247,900 |  | $ 247,900 |  |
Repurchase of convertible notes | 257,000 |  |  |  |  |  |
Outstanding principal balance |  |  | 62,000 |  | 62,000 |  |
Unamortized debt issuance costs |  |  | $ 30 |  | $ 30 |  |
Maturity date |  |  |  |  | Nov. 30, 2021 |  |
Interest rate |  |  | 1.00% | 1.00% | 1.00% | 1.00% | 1.00%
Effective interest rate |  |  | 1.40% |  | 1.40% |  |
Conversion price per share (in dollars per share) |  |  | $ 66.81 |  | $ 66.81 |  |
Total shares of common stock subject to conversion (in shares) |  |  | 0.9 |  | 0.9 |  |
Loss on early retirement of debt | $ 8,600 |  |  |  |  |  |
Percentage of principal amount used as purchase price upon occurrence of fundamental change |  |  |  |  | 100.00% |  |

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- Definition The net cash outflow from payments for hedge transactions and proceeds from the issuance of warrants. The call spread transaction was entered into to minimize the impact of potential economic dilution upon conversion of the 0.125% notes issued. + References No definition available. + Details
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- Definition The computed conversion price per share of the debt instrument based on the the conversion feature embedded in the debt instrument and the impact of the purchased hedges in the call spread transaction. + References No definition available. + Details
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- Definition The percentage of the principal amount of the notes to be purchased, plus accrued and unpaid interest, upon the occurrence of certain fundamental changes, as set forth in the indenture governing the convertible notes. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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