Equity and Temporary Equity, Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended		3 Months Ended		15 Months Ended
	Oct. 15, 2018	Oct. 01, 2018	Feb. 28, 2019	Jun. 30, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018	Nov. 30, 2004
Class of Stock [Line Items]
Issuance of common stock and common OP units, net					$ (4,321)	$ (3,296)	$ 163,800
Aggregate Value of Shares to be Issued in Accordance to Sales Agreement					$ 450,000
Commission, Maximum Percentage of Gross Sales Price Per Share According to Sales Agreement					2.00%
Series D Preferred OP Units
Class of Stock [Line Items]
Temporary Equity, Dividends For Term One, Percentage			3.75%
Series A-4 Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Dividends Per Share, Declared					$ 0.40625
Payments of dividends		$ 432
Common Stock
Class of Stock [Line Items]
Dividends per common share					$ 0.75
Payments of dividends	$ 66,886
Common Stock
Class of Stock [Line Items]
Issuance of common stock and common OP units, net					$ 1	$ 2
Authorized to be repurchased (in shares)								1,000,000
Remaining number of shares authorized to be repurchased (in shares)					400,000
Conversion of Common OP Units to common stock (in shares)					0
Series A-4 preferred OP units
Class of Stock [Line Items]
Conversion of Common OP Units to common stock (in shares)					0	2,373
Series A-4 preferred OP units | Common OP Units
Class of Stock [Line Items]
Conversion of Common OP Units to common stock (in shares)					0	1,054
Conversion of Common OP Units
Class of Stock [Line Items]
Conversion of Common OP Units to common stock (in shares)					6,533	6,777
Conversion of Common OP Units | Common OP Units
Class of Stock [Line Items]
Conversion of Common OP Units to common stock (in shares)					6,533
Series A-1 Preferred OP Units
Class of Stock [Line Items]
Conversion of Common OP Units to common stock (in shares)					3,950	3,700
Series A-1 Preferred OP Units | Common OP Units
Class of Stock [Line Items]
Conversion of Common OP Units to common stock (in shares)					9,633	9,023
NG Sun LLC [Member] | Sun NG RV Resorts [Member]
Class of Stock [Line Items]
Variable Interest Entity, Equity Interests Issued, Floating Rate					5.00%
NG Sun LLC [Member] | Common Stock | Sun NG RV Resorts [Member]
Class of Stock [Line Items]
Variable Interest Entity, Equity Interests Issued				$ 6,500
Sun NG RV Resorts [Member] | Common Stock | Sun NG RV Resorts [Member]
Class of Stock [Line Items]
Variable Interest Entity, Equity Interests Issued				$ 15,400