Summary of Significant Accounting Policies Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Homebuilding operations percent of total revenue	97.00%	98.00%	98.00%
Revenue	$ 3,046,145	$ 2,500,290	$ 2,286,282
Gain (Loss) on Hedging Activity	(19,000)	(12,100)	3,600
Construction [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,939,962	2,420,348	2,217,197
Land [Member]
Disaggregation of Revenue [Line Items]
Revenue	19,170	24,619	16,889
Financial Services Sector [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 87,013	$ 55,323	$ 52,196