Segment Information (Land-Related Charges by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Land-related charges	$ 1,368	$ 9,729
Operating Segments | Northeast
Restructuring Cost and Reserve [Line Items]
Land-related charges	116	4,753
Operating Segments | Southeast
Restructuring Cost and Reserve [Line Items]
Land-related charges	456	748
Operating Segments | Florida
Restructuring Cost and Reserve [Line Items]
Land-related charges	131	522
Operating Segments | Midwest
Restructuring Cost and Reserve [Line Items]
Land-related charges	54	777
Operating Segments | Texas
Restructuring Cost and Reserve [Line Items]
Land-related charges	527	656
Operating Segments | West
Restructuring Cost and Reserve [Line Items]
Land-related charges	84	1,529
Operating Segments | Other homebuilding
Restructuring Cost and Reserve [Line Items]
Land-related charges	$ 0	$ 744