Commitments and Contingencies Commitments and Contingencies (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Commitments and Contingencies [Abstract]
Letters of Credit and Completion Bonds	$ 261,600
Outstanding Performance and Maintenance Bonds	193,900
Performance letters of credit outstanding	53,800
Financial Letters of Credit	7,200
Financial Letters of Credit representing deposits on land and lot purchase agreements	6,700
Financial Bonds	6,700
Outstanding Deposits On Land and Lots	65,300
Land Purchase Deposits	45,357	$ 28,532
Prepaid Land Acquisition Costs	10,092	5,688
Short-term Non-bank Loans and Notes Payable	3,100
Unrecorded Conditional Purchase Obligation	799,700
Consolidated Inventory Not Owned	9,914	7,934
Obligation for consolidated inventory not owned	$ 9,914	$ 7,934