Fair Value Measurements Cash Flow Model Critical Assumptions (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Notes payable bank - financial services operations	$ 50,442,000	$ 67,957,000
Increase in Investments in Unconsolidated LLCs and other joint agreements	16,900,000
Limited Partners' Contributed Capital	28,600,000
Notes Receivable, Related Parties	2,500,000
Capitalized Interest and Other Costs Included in Investment in Unconsolidated LLCs and other joint agreements	$ 700,000	$ 800,000
Minimum [Member]
Equity Method Investment, Ownership Percentage	25.00%
Discount Rate Used in Determining Fair Value of Investments in Unconsolidated LLCs and other joint agreements [Abstract]
Discount Rate Used in Determining Fair Value of Investments in Unconsolidated LLCs and other joint agreements	13.00%
Maximum [Member]
Equity Method Investment, Ownership Percentage	61.00%
Discount Rate Used in Determining Fair Value of Investments in Unconsolidated LLCs and other joint agreements [Abstract]
Discount Rate Used in Determining Fair Value of Investments in Unconsolidated LLCs and other joint agreements	16.00%
2013 [Member]
Weighted Average Sales Price Increase	0.00%
Weighted Average Increase of Assumed Costs	0.00%
2014 and 2015 [Member]
Weighted Average Sales Price Increase	4.00%
Weighted Average Increase of Assumed Costs	4.00%
2016 and Beyond [Member]
Weighted Average Sales Price Increase	2.00%
Weighted Average Increase of Assumed Costs	2.00%