Commitments to Acquire/Dispose of Real Estate (Details) - Subsequent Event [Member] $ in Thousands	Jul. 29, 2016 USD ($) property
Commitments to Dispose of Real Estate
Properties Contracted To Be Disposed | property	9
Units Contracted To Be Disposed	1,344
Sales Price For Commitments To Dispose	$ 227,830
Rental Properties Disposed of [Member]
Commitments to Dispose of Real Estate
Properties Contracted To Be Disposed | property	9
Units Contracted To Be Disposed	1,344
Sales Price For Commitments To Dispose	$ 191,680
Land [Member]
Commitments to Dispose of Real Estate
Land Parcels Contracted To Be Disposed	2
Sales Price For Commitments To Dispose	$ 36,150