Schedule III Real Estate and Accumulated Depreciation - Part Two - Changes in Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of real estate accumulated depreciation [Roll Forward]
Accumulated Depreciation, Beginning Balance	$ 1,516,694	$ 1,399,531	$ 1,282,423
Depreciation expense	130,022	121,455	117,400
Amortization of in-place leases	(7,187)	(2,231)	(3,373)
Amortization of in-place leases	(14,547)
Dispositions and other	(7,468)	(6,523)	(3,665)
Accumulated Depreciation, Ending Balance	1,631,888	1,516,694	1,399,531
Rental home depreciation expense	$ 9,800	$ 10,400	$ 10,700