FAIR VALUE DISCLOSURES - Narrative (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) acquisition	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Recurring [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liability	$ 818,000	$ 2,700,000	$ 3,900,000
Contingent consideration asset	$ 0	$ 350,000	$ 0
Acquisitions With Contingent Consideration Arrangements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of real estate acquisitions | acquisition	4
Contingent consideration asset	$ 0