Segment Reporting - Total Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total Assets	$ 4,458,194	$ 3,864,920
Homebuilding:
Segment Reporting Information [Line Items]
Total Assets	4,140,400	3,506,420
Financial Services:
Segment Reporting Information [Line Items]
Total Assets	317,794	358,500
Operating Segments | Homebuilding: | West
Segment Reporting Information [Line Items]
Total Assets	2,083,436	1,855,567
Operating Segments | Homebuilding: | Mountain
Segment Reporting Information [Line Items]
Total Assets	994,226	905,007
Operating Segments | Homebuilding: | East
Segment Reporting Information [Line Items]
Total Assets	372,166	274,937
Operating Segments | Financial Services: | Mortgage operations
Segment Reporting Information [Line Items]
Total Assets	225,971	279,649
Operating Segments | Financial Services: | Other
Segment Reporting Information [Line Items]
Total Assets	91,823	78,851
Corporate | Homebuilding:
Segment Reporting Information [Line Items]
Total Assets	$ 690,572	$ 470,909