Real Estate Acquisitions and Dispositions Real Estate Acquisitions, Carefree Purchase Price Allocation (Details) - Carefree Communities - USD ($) $ in Thousands	Jun. 09, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Investment in property		$ 1,670,981
Ground leases		33,270
In-Place leases		35,010
Deferred tax liability		(23,637)
Other liabilities		(15,665)
Inventory of manufactured homes		13,521
Below market leases		(29,340)
Total identifiable assets and liabilities assumed		$ 1,684,140
Cash, proceeds from dispositions held in escrow, or contingent liability	$ 1,684,140