Debt Debt (Details) (USD $)	3 Months Ended		9 Months Ended				3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 High Range Uncommittted Letter of Credit [Member]	Sep. 29, 2013 High Range Uncommittted Letter of Credit [Member]	Sep. 30, 2013 New Unsecured Credit Facility [Member]	Sep. 30, 2013 Prior Credit Facility [Member]	Jul. 17, 2013 Prior Credit Facility [Member]	Sep. 30, 2013 Maximum [Member] New Unsecured Credit Facility [Member]	Sep. 30, 2013 Minimum [Member] New Unsecured Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity							$ 200,000,000
Line of Credit Facility, Expiration Date							Jul. 18, 2016	Dec. 31, 2014
Loss on early extinguishment of debt	1,726,000	0	1,726,000	0
Optional increase in borrowing availability							25,000,000
Line of Credit Facility, Maximum Borrowing Capacity							225,000,000		140,000,000
Sub-limit for letters of credit							100,000,000
Credit Facility, Basis Spread on Variable Rate										3.25%	2.25%
Leverage ratio	60.00%		60.00%
Unsold owned land threshold	125.00%		125.00%
Maximum Investment in unrestricted subsidiaries and JVs threshold	30.00%		30.00%
Interest Coverage Ratio	1.50		1.50
Debt Instrument, Unused Borrowing Capacity, Amount	352,900,000		352,900,000
Line of Credit Facility, Amount Outstanding	0		0
letters of credit outstanding under credit facility	13,900,000		13,900,000
Maximum borrowing availability subject to limit	186,100,000		186,100,000
Number of Secured Letters of Credit Outstanding under Credit Facility	3		3
Maximum available amounts under Letter of Credit Facilities					10,000,000	8,000,000
Letters of Credit Outstanding Under Letter of Credit Facilities	15,500,000		15,500,000
Restricted Cash for Secured Letter of Credit Agreements	$ 15,800,000		$ 15,800,000