Segment Information Segment Information (Land-Related Charges by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Production Related Impairments or Charges	$ 2,422	$ 125,573	$ 5,841	$ 129,108
Northeast
Restructuring Cost and Reserve [Line Items]
Production Related Impairments or Charges	498	49,820	1,683	49,918
Southeast
Restructuring Cost and Reserve [Line Items]
Production Related Impairments or Charges	689	491	1,731	958
Florida
Restructuring Cost and Reserve [Line Items]
Production Related Impairments or Charges	226	8,602	409	8,754
Midwest
Restructuring Cost and Reserve [Line Items]
Production Related Impairments or Charges	372	7,567	1,118	8,095
Texas
Restructuring Cost and Reserve [Line Items]
Production Related Impairments or Charges	220	589	270	847
West
Restructuring Cost and Reserve [Line Items]
Production Related Impairments or Charges	148	54,409	361	56,441
Other homebuilding
Restructuring Cost and Reserve [Line Items]
Production Related Impairments or Charges	$ 269	$ 4,095	$ 269	$ 4,095