Basis of Presentation Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 567,842	$ 476,423	$ 1,563,797	$ 1,340,269
Gain (Loss) on Hedging Activity	(200)	(1,200)	3,000	1,300
Construction [Member]
Disaggregation of Revenue [Line Items]
Revenue	554,820	459,342	1,518,278	1,289,893
Land [Member]
Disaggregation of Revenue [Line Items]
Revenue	829	5,318	6,424	12,438
Financial Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	12,193	11,763	39,095	37,938
Midwest Homebuilding [Member]
Disaggregation of Revenue [Line Items]
Revenue	236,803	180,488	622,325	495,379
Southern Homebuilding [Member]
Disaggregation of Revenue [Line Items]
Revenue	221,044	176,502	649,014	504,647
Mid-Atlantic Homebuilding [Member]
Disaggregation of Revenue [Line Items]
Revenue	97,802	107,670	253,363	302,305
Financial Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 12,193	$ 11,763	$ 39,095	$ 37,938