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Fair Value Disclosures (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2020
Mar. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Impairment charge $ 0   $ 1,691  
Texas [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Impairment charge   $ 900    
Century Complete [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Inventory before impairment       $ 800