Commitments to Acquire/Dispose of Real Estate (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Commitments to Acquire Real Estate
Properties Acquired-Total	0
Rental Units Acquired - Total	0
Purchase Price - Total	$ 39,300
Commitments to Dispose of Real Estate
Properties Disposed - Total	2
Rental Units Disposed-Total	688
Sales Price For Commitments To Dispose	94,532
Land Parcel [Member]
Commitments to Acquire Real Estate
Purchase Price - Total	39,300
Land Parcels Contracted to be Acquired	2
Rental Properties Disposed of [Member]
Commitments to Dispose of Real Estate
Properties Disposed - Total	2
Rental Units Disposed-Total	688
Sales Price For Commitments To Dispose	68,182
Land Parcel [Member]
Commitments to Dispose of Real Estate
Sales Price For Commitments To Dispose	$ 26,350
Land Parcels Contracted to be Disposed	1