Commitments and Contingencies Commitments and Contingencies (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Commitments and Contingencies [Abstract]
Letters of Credit and Completion Bonds	$ 235,400
Outstanding Performance and Maintenance Bonds	159,100
Performance letters of credit outstanding	56,500
Financial Letters of Credit	12,700
Financial Letters of Credit representing deposits on land and lot purchase agreements	12,200
Financial Bonds	7,100
Outstanding Deposits On Land and Lots	50,000
Land Purchase Deposits	28,532	$ 33,662
Prepaid Land Acquisition Costs	5,688	7,873
Short-term Non-bank Loans and Notes Payable	3,600
Unrecorded Conditional Purchase Obligation	685,000
Consolidated Inventory Not Owned	7,934	19,308
Obligation for consolidated inventory not owned	$ 7,934	$ 19,308