Transactions with Related Parties Related Party Ownership (Details)	Dec. 31, 2012 properties	Dec. 31, 2012 entities	Dec. 31, 2012 Total Owners [Member] owners	Dec. 31, 2012 Consolidated VIEs [Member] Integer	Sep. 30, 2012 Consolidated VIEs [Member] Total Owners [Member] properties
Number of Owners			4
Number of Variable Interest Entities	5	5		3	3