Segment Information Segment Information (Land-Related Charges by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]
Land-related charges	$ 125,573	$ 7,614	$ 129,108	$ 10,522
Northeast
Restructuring Cost and Reserve [Line Items]
Land-related charges	49,820	68	49,918	526
Southeast
Restructuring Cost and Reserve [Line Items]
Land-related charges	491	534	958	1,856
Florida
Restructuring Cost and Reserve [Line Items]
Land-related charges	8,602	280	8,754	529
Midwest
Restructuring Cost and Reserve [Line Items]
Land-related charges	7,567	398	8,095	851
Texas
Restructuring Cost and Reserve [Line Items]
Land-related charges	589	44	847	151
West
Restructuring Cost and Reserve [Line Items]
Land-related charges	54,409	6,290	56,441	6,609
Other homebuilding
Restructuring Cost and Reserve [Line Items]
Land-related charges	$ 4,095	$ 0	$ 4,095	$ 0