Fair Value Measurements Cash Flow Model Critical Assumptions (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Increase in Investments in Unconsolidated JVs and other joint agreements	$ 5,500,000
Limited Partners' Contributed Capital	40,800,000
Notes Receivable, Related Parties	2,500,000
Capitalized Interest and Other Costs Included in Investment in Unconsolidated JVs and other joint agreements	$ 750,000	$ 806,000
Minimum [Member]
Equity Method Investment, Ownership Percentage	25.00%
Discount Rate Used in Determining Fair Value of Investments in Unconsolidated JVs 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 JVs and other joint agreements	16.00%
Current Year [Member]
Weighted Average Sales Price Increase	0.00%
Weighted Average Increase of Assumed Costs	0.00%
Current Year plus 1 and 2 [Member] | Minimum [Member]
Weighted Average Sales Price Increase	2.00%
Weighted Average Increase of Assumed Costs	2.00%
Current Year plus 1 and 2 [Member] | Maximum [Member]
Weighted Average Sales Price Increase	4.00%
Weighted Average Increase of Assumed Costs	4.00%
Current Year plus 3 And Beyond [Member]
Weighted Average Sales Price Increase	2.00%
Weighted Average Increase of Assumed Costs	2.00%