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Debt - Schedule of Carrying Value of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 2,594,414	$ 2,283,732
Convertible senior notes
Debt Instrument [Line Items]
Total convertible senior notes	1,606,582	1,613,523
Convertible senior notes | 2026 Notes
Debt Instrument [Line Items]
Total convertible senior notes	$ 357,531	347,566
Stated Interest Rate	1.375%
Convertible senior notes | 2025 Notes
Debt Instrument [Line Items]
Total convertible senior notes	$ 428,830	414,888
Stated Interest Rate	2.75%
Convertible senior notes | 2024 Notes
Debt Instrument [Line Items]
Total convertible senior notes	$ 490,126	524,273
Stated Interest Rate	0.75%
Convertible senior notes | 2023 Notes
Debt Instrument [Line Items]
Total convertible senior notes	$ 330,095	326,796
Stated Interest Rate	1.50%
Mortgages segment
Debt Instrument [Line Items]
Warehouse line of credit	$ 163,387	309,043
Line of Credit | Homes segment
Debt Instrument [Line Items]
Short-term debt	824,445	361,166
Goldman Sachs Bank USA | Line of Credit | Homes segment
Debt Instrument [Line Items]
Short-term debt	183,373	145,825
Citibank, N.A. | Mortgages segment
Debt Instrument [Line Items]
Short-term debt	21,332	90,227
Citibank, N.A. | Line of Credit | Homes segment
Debt Instrument [Line Items]
Short-term debt	219,989	87,103
Credit Suisse AG, Cayman Islands | Mortgages segment
Debt Instrument [Line Items]
Short-term debt	99,706	149,913
Credit Suisse AG, Cayman Islands | Line of Credit | Homes segment
Debt Instrument [Line Items]
Short-term debt	421,083	128,238
Comerica Bank | Line of Credit | Mortgages segment
Debt Instrument [Line Items]
Warehouse line of credit	$ 42,349	$ 68,903

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Contractual interest rate for funds borrowed, under the debt agreement.

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