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Telford Acquisition - Summary of Excess Purchase Price Over Estimated Fair Value of Net Assets Acquired (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Oct. 01, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Excess purchase price over fair value of net assets acquired $ 3,821,609 $ 3,753,493   $ 3,652,309
Telford Homes        
Business Acquisition [Line Items]        
Purchase price     $ 328,502  
Less: Final fair value of net assets acquired     297,669  
Excess purchase price over fair value of net assets acquired     $ 30,833