Commitments and Contingencies Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Commitments and Contingencies [Abstract]
Letters of Credit and Completion Bonds	$ 61,795
Outstanding Performance and Maintenance Bonds	32,641
Performance letters of credit outstanding	16,232
Financial Letters of Credit	9,435
Financial Letters of Credit representing deposits on land and lot purchase agreements	4,138
Financial Bonds	3,487
Unrecorded Conditional Purchase Obligation	$ 240,506