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Equipment Note Payable - Summary of Annual Maturities of Equipment Notes Payable (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total $ 1,500,000 $ 800,000
Equipment Note Payable | UNITED WHOLESALE MORTGAGE, LLC    
Debt Instrument [Line Items]    
2021   6,299
2022   6,673
2023   6,851
2024   6,705
2025 and thereafter   0
Total   $ 26,528