Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2011
Variable Interest Entities
Cash deposits	$ 10.5
Letters Of Credit	$ 6.7
Right to acquire lots under Options Contracts	2,957

Quantifies the entity's maximum exposure to loss.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4 and FIN46(R)-8
-Paragraph C6
-Subparagraph c

Name:	us-gaap_VariableInterestMaximumExposureToLoss
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant