DESCRIPTION OF BUSINESS AND PRINCIPLES OF INTERIM STATEMENTS - Additional Information (Details)	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($) Transaction	Dec. 31, 2016 USD ($)	Dec. 31, 2015 Transaction
Description of Business [Line Items]
Impairment charge other-than-temporary impairments	$ 0	$ 0
Available-for-sale Securities	0		$ 0
Allowance for doubtful accounts	0		0
Reserves for uncertain income tax positions	0
Tenant Reimbursable Expenses
Description of Business [Line Items]
Accounts receivable included in other assets	449,000		125,000
Real Estate Operations
Description of Business [Line Items]
Accounts receivable included in other assets	2,400,000		3,800,000
Number of closed land transactions | Transaction		1		2
Membership And Event Receivables
Description of Business [Line Items]
Accounts receivable included in other assets	$ 348,000		$ 326,000