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Borrowing Arrangements - 2015 Activity (Details) $ in Thousands	12 Months Ended						24 Months Ended
	Dec. 31, 2017 USD ($) property loan	Dec. 31, 2016 USD ($) integer	Dec. 31, 2015 property	Dec. 31, 2015 USD ($) property	Dec. 31, 2015 property loan	Dec. 31, 2015 property integer	Dec. 31, 2016 USD ($) integer
Debt Instrument [Line Items]
Mortgage notes payable financing proceeds	$ 350,369	$ 88,050		$ 395,323
Debt instrument, term (in years)	20 years
Weighted average interest rate (in percentage)	4.80%
Number of pledged properties	120	126					126
Payments of debt extinguishment costs				17,000
Number of loans	3				4	2
Stated interest rate (in percentage)	4.07%
Mortgage debt assumed	$ 5,900	$ 22,600					$ 22,600
Net unamortized premiums	$ (3,253)
Minimum
Debt Instrument [Line Items]
Stated interest rate (in percentage)	3.10%
Maximum
Debt Instrument [Line Items]
Stated interest rate (in percentage)	8.90%
New Credit Facilities
Debt Instrument [Line Items]
Mortgage notes payable financing proceeds				$ 395,300
Debt instrument, term (in years)		23 years	21 years
Weighted average interest rate (in percentage)			3.93%	3.93%	3.93%	3.93%
Number of pledged properties | property			26	26	26	26
Old Credit Facilities
Debt Instrument [Line Items]
Weighted average interest rate (in percentage)			5.58%	5.58%	5.58%	5.58%
Number of pledged properties | property			32	32	32	32
Repayments of long-term debt				$ 48,700			$ 370,200
Manufactured homes | Old Credit Facilities
Debt Instrument [Line Items]
Weighted average interest rate (in percentage)			5.73%	5.73%	5.73%	5.73%
Number of pledged properties | property			1	1	1	1
R V Resort | Old Credit Facilities
Debt Instrument [Line Items]
Number of pledged properties | property			3	3	3	3

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt discount (premium).

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