Accounting Policies (Details Textual 1) $ in Millions	Sep. 30, 2015 USD ($) property entity
Variable Interest Entity [Line Items]
Maximum loss exposure for unconsolidated variable interest entities | $	$ 339
Primary beneficiary [Member]
Variable Interest Entity [Line Items]
Number of variable interest entities	25
Number of properties represented by variable interest entities | property	21
Not primary beneficiary [Member]
Variable Interest Entity [Line Items]
Number of variable interest entities	64