Commitments to Acquire/Dispose of Real Estate (Details) - Commitments [Member] $ in Thousands	Apr. 29, 2016 USD ($) property
Commitments to Dispose of Real Estate
Properties Contracted To Be Disposed | property	4
Units Contracted To Be Disposed	772
Sales Price For Commitments To Dispose	$ 201,000
Rental Properties Disposed of [Member]
Commitments to Dispose of Real Estate
Properties Contracted To Be Disposed | property	4
Units Contracted To Be Disposed	772
Sales Price For Commitments To Dispose	$ 134,450
Land [Member]
Commitments to Dispose of Real Estate
Land Parcels Contracted To Be Disposed	3
Sales Price For Commitments To Dispose	$ 66,550