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Debt - Schedule of Carrying Value of Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | May 19, 2020 | May 15, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total | $ 2,077,991 |  |  | $ 2,274,990
Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Convertible senior notes | $ 1,845,594 |  |  | 1,553,039
Convertible Debt | 1.375% convertible senior notes due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated Interest Rate | 1.375% |  |  |
Convertible senior notes | $ 342,316 |  |  | 327,187
Convertible Debt | 2.75% convertible senior notes due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated Interest Rate | 2.75% | 2.75% | 2.75% |
Convertible senior notes | $ 408,323 |  |  | 0
Convertible Debt | 0.75% convertible senior notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated Interest Rate | 0.75% |  |  |
Convertible senior notes | $ 515,573 |  |  | 490,538
Convertible Debt | 1.50% convertible senior notes due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated Interest Rate | 1.50% |  |  |
Convertible senior notes | $ 322,535 |  |  | 310,175
Convertible Debt | 2.00% convertible senior notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated Interest Rate | 2.00% |  |  |
Convertible senior notes | $ 249,263 |  |  | 415,502
Convertible Debt | 2.75% convertible senior notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated Interest Rate | 2.75% |  |  |
Convertible senior notes | $ 7,584 |  |  | 9,637
Mortgages Segment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Warehouse line of credit | 118,094 |  |  | 30,427
Line of Credit | Homes Segment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | 114,303 |  |  | 691,524
Goldman Sachs Bank USA | Line of Credit | Homes Segment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | 22,460 |  |  | 39,244
Citibank, N.A. | Mortgages Segment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | 58,859 |  |  | 394
Citibank, N.A. | Line of Credit | Homes Segment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | 28,512 |  |  | 296,369
Credit Suisse AG, Cayman Islands | Line of Credit | Homes Segment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | 63,331 |  |  | 355,911
Comerica Bank | Line of Credit | Mortgages Segment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Warehouse line of credit | $ 59,235 |  |  | $ 30,033

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: 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(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: 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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