Commitments and Contingencies Commitments and Contingencies (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Commitments and Contingencies [Abstract]
Letters of Credit and Completion Bonds	$ 154,310
Outstanding Performance and Maintenance Bonds	108,923
Performance letters of credit outstanding	31,489
Financial Letters of Credit	6,187
Financial Letters of Credit representing deposits on land and lot purchase agreements	4,479
Financial Bonds	7,711
Unrecorded Conditional Purchase Obligation	$ 556,229