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Inventory (Details) - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Inventory Disclosure [Abstract]      
Finished Homes and Homes under Construction $ 535,138,000   $ 356,706,000
Inventory, Real Estate, Land and Land Development Costs 567,398,000   482,371,000
Inventory, Land Held-for-sale 3,605,000   5,558,000
Total inventory $ 1,106,141,000   $ 844,635,000
Document Period End Date Jun. 30, 2021    
Earnest Money Deposits and Pre-acquisition Costs Written-Off $ 43,000 $ 1,532,000  
Impairment of Real Estate   $ 0.0