Investment in Real Estate - Narratives (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Jan. 23, 2019 USD ($) property site	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) property land marina site	Dec. 31, 2018 USD ($) property site	Dec. 31, 2017 USD ($) property site
Real Estate Properties
Number of properties acquired | property			4		2
Purchase price			$ 58,300	$ 251,700	$ 142,400
Number of sites acquired | site			1,614	3,712	1,870
Mortgage debt assumed			$ 18,600		$ 5,900
Mortgage premium transferred			600
Assets acquired			249,197	$ 265,129	142,255
Long-term debt assumed				9,200
Asset acquisition, liabilities incurred				8,800
Gain on sale of real estate, net			52,507	$ 0	$ 0
Manufactured Homes in Indiana and Michigan | Disposed of by Sale, Not Discontinued Operations
Real Estate Properties
Number of properties sold (property) | property	5
Number of sites sold | site	1,463
Proceeds from sales of properties	$ 89,700
Gain on sale of real estate, net		$ 52,500
Net investment in real estate	35,400
Other assets	500
Mortgage notes payable	$ 11,200
Loggerhead Marina Portfolio
Real Estate Properties
Purchase price			$ 49,000
Number of marinas (marinas) | marina			11
Repayments of outstanding debt			$ 72,000
Assets acquired			162,200
Loggerhead Marina Portfolio | Joint venture
Real Estate Properties
Assets acquired			35,800
Land
Real Estate Properties
Purchase price			$ 28,100
Number of land parcels (land) | land			3
R V Resort
Real Estate Properties
Number of properties acquired | property				4
Vacant Land
Real Estate Properties
Number of properties acquired | property				4
Purchase price				$ 2,800
Number of assets acquired | property				2