Accounting Policies (Details Textuals) - Jun. 30, 2015 $ in Millions	USD ($) property entity
Variable Interest Entity [Line Items]
Maximum loss exposure for unconsolidated variable interest entities | $	$ 336
Primary beneficiary [Member]
Variable Interest Entity [Line Items]
Number of variable interest entities	24
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