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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